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Real-world examples
-20 Typical freezer 0 Freezing point of water 4 Typical refrigerator 22 Room temperature 30 Temperate climate 37 Body temperature 100 Boiling point of water
1 °C = 1 K, and absolute zero is -273.15 °C
Says the article. Complete nonsense. 1 °C = 274.15 K not 1K. This needs to be fixed.
Jimp 17Oct05
Now it's fixed. Jimp 19Oct05
I think you're either missing the point or deliberately misunderstanding things Jimp.
It is stating that 1 degree on the Kelvin scale is equivalent to 1 degree on the Celsius scale. Which is correct. DurhamMatt
The correct statement is "A change of 1 °C = 1 K"
As a matter of empirical FACT, Fahrenheit is used quite widely in the UK. The Fahrenheit article likewise is WRONG. But hey, who cares about facts when Wikipedia editors decide to push an agenda? — Preceding unsigned comment added by 92.12.18.129 ( talk) 08:25, 3 February 2022 (UTC)
Why is something of tertiary importance to the subject in the 2nd of 7 major sections? Typesetting should be (IMO) just before the references - if included at all. Alanbrowne ( talk) 16:23, 11 May 2013 (UTC)
My research indicates that the original name centigrade came about because there were 100 graduations (steps) between the freezing and boiling points of water, and that the name was changed to Celsius less from a desire to recognise the man himself but more a desire to end confusion caused by:
Don't have conclusive evidence yet though.
Also, NIST and other standards bodies around the world seem to agree that Celsius should always be capitalized when spelt out.
I do not follow why 'centigrade' is confusing. A degree Celsius is 1/100 of a 'grade' between 0 and 100 degrees. Could someone explain this more clearly?
There is a general trend in science to use a captial letter for a proper name, but it is not strict. For example, 5.2Mt is 5.2 mega tonnes. This differentiates milli from mega. Micro uses the Greek letter mu. C is not used elsewhere as a multiplier, so I suspect it always stood for the proper name Celsius. Such details may not lend themselves to historical investigation, unless there was a widespread acceptance of what C stood for. 220.244.75.119 ( talk) 09:08, 28 May 2014 (UTC)
Toby Bartels' explanation is a lot clearer than what is in the article. Ccrrccrr ( talk) 00:49, 6 November 2016 (UTC)
Also, I believe that renaming physical quantities to honor a person, such as 'cycles per second' to 'Hertz', is to me an imposition of human ego on the perfection of the Universe. David 21:10 Apr 27, 2003 (UTC)
No one has ever said '100 megacycle by second'. The correct usage was '100 megacycles'. (The 'per second' was implied.)
We only prefer "Megahertz" now to "megacycles" because we have become used to it. That is how language naturally changes, through common usage. That does not make one term better than another. "Megacycles" is better than "Megahertz", in my opinion, because it is more descriptive of the physics involved. David 16:30 Apr 29, 2003 (UTC)
Yes, the USA, and Jamaica, apparently, are the last holdout for Fahrenheit for everyday, non-scientific temperature measurement, but Wikipedia editors should not parlay their annoyance at this situation into non-NPOV prose. As of today, I've toned down the text in this article and in the Fahrenheit article so that it reads less like commentary. There is no need to mention that Europeans find it "puzzling" that the USA is one of a "declining number of countries" "still" using this system, phrases which together imply fault. - mjb 00:47, 10 Apr 2004 (UTC)
In the United States will stay temperature "Fahrenheit". - Ronald20 18:15, 06 June 2006 (UTC))
Wikipedia could really use a way to let the reader see their own preferred units. Since .org is a USA domain... yup, we like our Fahrenheit. The same goes for any other unit. So how about some Wiki syntax that lets the editor use units they prefer, while not annoying the reader? Otherwise I propose to fix all this senseless Celsius stuff. :-)
Well, if it were any other country in the world, the USA would be among the most prominent to pressure the country to finally adopt to the system every other country is using. JIP | Talk 07:18, 18 May 2007 (UTC)
According to some sources (such as http://susning.nu/Celsius for the fortunate few who read Swedish) Anders Celsius first defined 100 degrees as the temperature at which water freezes and zero degrees as the temperature at which water boils (the advantage of this, I suppose, being that outdoor temperatures would always be in the positive range). Before the scale became used to any measurable extent, however, this was changed to what we're used to today.
If this is true, it should perhaps be noted in the article.
From my science education the original scale had four elements which should all be mentioned: (1) Freezing temperature of water, defined as 0; (2) Boiling temperature of water, defined as 100; (3) Measurement of (1) and (2) at standard atmospheric pressure, sea level, (4) Linear interpolation between 0 and 100 and extrapolation below 0 and above 100. I think it's important to explicitly state the linear nature of the scale, otherwise it is an unstated assumption.
The table is on - http://en.wikipedia.org/wiki/Celsius 2011- 09- 29 — Preceding unsigned comment added by 74.220.169.123 ( talk) 13:59, 29 September 2011 (UTC)
The sentence
"Fahrenheit remains the preferred scale for everyday temperature measurement, although Celsius or kelvin are used for scientific applications."
should either be changed to reflect that it s NOT the preferred scale in Europe or like, or it should be removed.
Actually I don't know of the Fahrenheit use, other than in US.
Don't bother telling that euro anything all the good ones were killed in ww1 and ww2. —Preceding unsigned comment added by 75.187.183.85 ( talk) 22:37, 10 January 2008 (UTC)
Why does the article say: "a method for converting Celsius to Fahrenheit is to add 40, multiply by 1.8, and subtract 40." etc. (huh??)
...but the sidebar says: °F = °C × 1.8 + 32
johnq 09:20, Dec 29, 2004 (UTC)
The article currently seems to spell celsius with a captial letter when refering to the measurement of temperature. I always thought the general rule was that when units are named after a person then when the full name is spelt out there is no capitalisation, however when just the initial of the unit is used then it is in capitals. So for example you would write 10 degrees celsius or 10 °C. The units watt, joule, volt, newton, farad, henry and tesla all seem to follow this rule. Is there an exception for celsius? or is the article wrong? -- Popsracer 02:15, 25 Jan 2005 (UTC)
When was celsius redefined in terms of kelvin? The article doesn't say. — Ævar Arnfjörð Bjarmason 07:39, 2005 Mar 15 (UTC)
I removed this section from the article because it does not seem to be in common usage - a Google search revealed only one reputable use, on the UK Metric Association's website.
I also removed the above. Whilst this is an interesting indicator of the increasing innumeracy of the British public, it doesn't seem specifically relevant on a page about the Celsius scale.
-- Hex 13:36, 30 May 2005 (UTC)
I seem to remember when the BBC changed from using centigrade to celsius in weather forecasts that the explanation was that they were not the same. Centigrade was defined by graduating the points for 0 and 100 on a particular measuring device into 100 equal parts, whereas celsius was done by graduating between 0 and 100 with 100 equal temperature changes. These two would be different if the expansion of the say liquid in the device was not uniform over the range 0 to 100. Is my memory faulty or the explanation or both? Bornintheguz 1 July 2005 18:44 (UTC)
Before the 9th CGPM, 1948, Celsius and Centigrade were both used to denote the same unit of temperature defined by the freezing and boiling points of water. In 1948 the unit was re-defined based on the triple point of water and at the same time its name was standardised to Celsius. It then appears that Centigrade was never the correct term for the new definition. I then guess that technically, if mentioning degrees Centigrade, one should be referring to the temperature as measured before 1948, which would then imply the old scale. -- Brunik ( talk) 12:09, 3 March 2009 (UTC)
Actually that's not entirely true.. The Kelvin is the SI unit of tempertaure based on the ideal gas equation, a linear scale relating to the tripple point of water (273.15 by definition) and can only occur at one value of P and T and such is reproducible internationally.
The ice point is the temperature at which ice and air-saturated water co-exist at equilibrium at a pressure of 1 atm. The centigrade scale gave 0 degrees at the ice point of water and 100 degrees at the steam point and was a function with 100 grades between the two points. The steam and ice points were hard to reproduce sufficiently accurately so the celcius scale was devised which was based on the same grading as the original centigrade scale but used the tripple point of water as the fixed point and had the same grading as the centigrade scale, this gives an ice point of 0C and a steam point of 99.97C. - Thermodynamics can be pedantic!
I've changed the opening line to include historically, since centigrade and Celsius are not the same, with a reference to it. Please do not revert!! Discuss here. I understand the Encyclopedia Britannica says one thing, but to be honest it's clear they just wrote that out without due process of the differentiation. Of course, edit to clarify but the intent is to maintain that "centigrade" is not and should not be used as a measurement unit. Cpt ricard ( talk) 00:40, 17 March 2015 (UTC)
Since the name of the unit is "degree Celsius", shouldn't the article be moved there? I hesitate because it implies a lot of redirect checking...
Urhixidur 12:48, 2005 July 28 (UTC)
I changed it from reading "an SI unit" to simply "a unit" given that it isn't technically an SI unit. If I am off-base, that is fine, but as I understand it, kelvins are the only SI units of temperature. Tmrobertson 05:14, 5 November 2005 (UTC)
And I changed it again to an " SI derived unit" based on what has been already established in the SI page. Sorry if I covered old ground. Tmrobertson 05:18, 5 November 2005 (UTC)
On 2005-09-11 12:39:50 Bobblewik "copyedited" the article from this to this diff, since then the article has in my opionion gotten drastically worse. For instance it now claims in the first paragraph that the unit is defined with the freezing point of water at 0 degrees and the boiling point at 100 degrees, but in reality the unit hasn't had a definition that's anything like that since 1954!, and even before then it was 0 and 100 at standard atmospheric pressure. That's not the only problem with that version however, it split content into multiple sections that could easily have fitted as prose in the first paragraph etc. — Ævar Arnfjörð Bjarmason 20:43, 21 November 2005 (UTC)
IF and ONLY IF Wikipedia is "aiming" at scientists and engineers, then yes - I would agree with you. The fact is that Wikipedia is not meant strictly for engineers and scientists, and in general - when people come to Wikipedia, they are looking for common answers to common questions. Therefore, the definitions of 0 deg C (freezing) and 100 deg C (boiling) are PERFECTLY ADEQUATE and appropriate. This scientific "look how smart I am" nit picking over and re-writing of articles has GOT to stop. Very few people in the real world care about .01 deg Celsius, or the 1948 ... blah blah history of how the units are defined, limits, boundaries, etc. IF they do, then let them drill down to the appropriate section wherein you all can flex your superior intellectual powers and show that, indeed, you know all about the Celsius temperature scale. I get tired of having to come here and write these rants discouraging bad behavior. In its most vulgar form, it is nothing more than a bad case of Intellectual Elitism. Wikipedia has slowly been taken over by people who seem to be stricken with Asperger's Syndrome. For those of you who need to continually display your intellect, might I suggest a return to academia, where you can publish inane articles to your heart's content; and to the amazement of your friends and colleagues. Here in Wikipedia land, it just puts people off and discourages them from reading. Which is a BAD THING. tjp in Houston — Preceding
unsigned comment added by
98.194.39.86 (
talk)
22:42, 19 June 2016 (UTC)
Who is "Christian of Lyons" - it sound like a medieval person. : ) "Elvius from Sweden" is almost certainly Pehr Elvius the Elder, who was one of the predecessors of Celsius in the Uppsala chair of Physics, as well as his uncle by marriage. But in the bios I find on Elvius, I see nothing connected to this issue. The history section needs checking and referencing. up◦land 09:40, 10 December 2005 (UTC)
Please see the discussion at Talk:Units of measurement because it affects several units of measurement. bobblewik 22:03, 12 February 2006 (UTC)
In the United States will switch from Fahrenheit to Celsius. Ronald20 20:00, 10 June 2006 (UTC)
However, in the United States not yet switched to temperature Celsius. They still used a temperature Fahrenheit. Ronald20 18:21, 15 June 2006 (UTC)
A pedantic objection, perhaps:
According to the table, the freezing point of water is "0" and the boiling point is "100" on the Celsius scale. This would suggest one of two things: either (a) these temperatures are EXACT, by definition, or (b) they are only known to the nearest one degree. Neither is true. I don't know whether anyone has measured the freezing and boiling points of water (at standard pressure) with enough precision to distinguish the "new" scale from the "old" one; I searched on Google for a while and couldn't find anything. But naively I would expect any deviation to occur around the 3rd decimal place, since absolute zero and the triple point are defined at two decimal places (i.e. the freezing point of water at standard pressure is likely to be 0.00x or -0.00x, where x is some non-zero digit).
To avoid this ambiguity, I would suggest changing the freezing and boiling points to 0.00 and 100.00, unless someone can find an accurate authoritative measurement. Mtford 04:07, 19 June 2006 (UTC)
I've been trying to find a reference for the fact that the scale was reversed, and I've been running into some inconsistencies. I haven't found anything really authoritative (in many cases it's just a footnote), and different books give different dates and authors of the reversal. I found these searching for "celsius 1744 reversed" and "celsius reversed" in Google Books. Here are some results:
I found some old books about Celsius in my university library, but all of them seem to be in Swedish, which I don't read. Itub 18:51, 19 July 2006 (UTC)
I searched "Jean Pierre Christin" and found this book "A Chronology of Microbiology in Historical Context" which claims Christin inverted it in 1743. Ctchou 13:23, 16 April 2007 (UTC)
I just checked the SI page, and it doesnt seem like degrees Celsius is a SI unit at all - kelvin is, Celsius is just a common unit. Am I wrong? Yarilo2 03:15, 22 September 2006 (UTC)
·Never mind. I see now that degree celsius is not a unit of SI but rather a derived unit of SI, which still counts. Cheers, Yarilo2 03:24, 22 September 2006 (UTC)
Someone needs to carefully look at the history section and correct it if necessary. The information (misinformation?) there keeps getting repeated on the Internet by other sources that simply copy what Wikipedia says. I'm not going to do it because I don't have the stomach for the holy wars that result from wholesale deletions of information; even when it's completely incorrect. First, the un-cited claim that botanist Carolus Linnaeus was not responsible for reversing Celsius' scale to its current form is contrary to authoritative sources such as Thermodynamics-information.net: A Brief History of Temperature Measurement and, Uppsala University (Sweden): Linnaeus’ thermometer. That second reference is the botany school that Linnaeus founded. Furthermore, the notion that water's boiling point would be defined at a pressure of only 1000 mbar is highly suspect. Such a pressure (as opposed to the median seal-level value of 1013.25 mbar) would produce a boiling point on today's Celsius scale of 99.632 °C. This flies in the face of the practical reality of the time: Paris, where many of these standards were set, is only about 45 to 58 meters above sea level. All the modern SI work (acceleration of gravity, densities, temperatures) were originally predicated upon sea-level pressure at the latitude of Paris. Water's boiling point has always been defined at one standard atmosphere. As far as I know, this "1000 mbar" idea is the modern product of a 1985 IUPAC decision for measuring the physical properties of substances including the chemical elements. Greg L 02:58, 5 October 2006 (UTC)
As it was written: “Throughout the world (except for the U.S.), the Celsius scale is used for most temperature measuring purposes. The entire scientific world (the U.S. included) uses the Celsius and Kelvin scales. Many engineering fields in the U.S., especially high-tech ones, also use the Celsius scale. The bulk of the U.S. however, (its lay people, industry, meteorology, and government) relies upon the Fahrenheit scale. Jamaica is currently converting to Celsius.” …it doesn't make sense to mention the Kelvin scale for science if all the other scales for the other uses aren't also disclosed. One begins running off on a tangent by introducing the subject of a thermodynamic scale (kelvin) which isn't the subject of this article. Completing these tangencies all the way for consistency results in a paragraph that reads as follows:
The whole point of this paragraph is to address who's using the Celsius scale. That's why the sentence regarding the scientific world would properly tell that it uses the Celsius scale—not that it measures temperature exclusively with the Celsius scale; just that it uses it. In the case of the lay person in the U.S., Fahrenheit must necessarily be discussed simply because of the conspicuous fact that the Celsius isn't used for this widespread audience. For logical consistency, the most straightforward wording for where the Celsius scale is used is as follows (emphasis added here only):
The above: “The entire scientific world (the U.S. included) uses the Celsius scale.” is an absolutely true statement and properly sticks to the simple subject of who is using the Celsius scale. As written, this paragaph doesn't try to pretend to enumerate every scale currently being used for these different disciplines. Greg L 04:35, 13 October 2006 (UTC)
Vandalism doesn't always go unpunished. The IP address (208.220.136.66) from which some contributors vandalized this Celsius article traced back to The Potomac School in Virginia. It's a fine, K-12 private school three miles from Washington D.C. There was something about the nature of the vandalism (including this choice entry: “everybody is a gay fagg in the world”) that led me to feel grown-ups ought to know about it. So I informed the school’s officials. Through fortuitous timing, I happened to have contacted the school’s authorities roughly three hours after it happened. I received the following reply from a school administrator several hours later:
I appreciate everyone's work on this. I have spoken to the boy who admits to being the author of two of the quotes, and he has mentioned another boy who I will speak to tomorrow. He is probably reponsible for the third quote. The only question is regarding quote number 2, but I expect that they will provide that information tomorrow. Please rest assured that there will be serious consequences for all involved. I really appreciate your quick action in letting us know.
The part that's noteworthy about this is that this kid was confronted in a Virginia private school about four hours after he anonymously committed some vandalism to an article on the Web. If I was a ninth-grader and this happened to me, I'd sure be shocked. Signed: [Anonymous (to help avoid other acts of vandalism) on Wednesday, October 18, 2006 at 21:52]
The statements that I just took out, but probably haven't completely fixed yet, about the usage for temperature intervals, indicate a gross misunderstanding of the actual resolution of the 13th CGPM, especially the point number 2:
1. the unit of thermodynamic temperature is denoted by the name “kelvin” and its symbol is “K”;
2. the same name and the same symbol are used to express a temperature interval;
3. a temperature interval may also be expressed in degrees Celsius;
4. the decisions mentioned in the opening paragraph concerning the name of the unit of thermodynamic temperature, its symbol and the designation of the unit to express an interval or a difference of temperatures are abrogated, but the usages which derive from these decisions remain permissible for the time being.
Even though it comes before point 3, rule 2 applies to it as well. The proper, current symbol is °C, in any context, whether a temperature reading or a temperature interval. The 1948 rules were "abrogated" in the legalese of this 1967-68 resolution. Gene Nygaard 02:47, 7 November 2006 (UTC)
In other words, a big part of the whole philosophy of this resolution was the clarification that the "thermodynamic temperature" and a "temperature interval" are not really different things. So let's not try to step back into the past in our article here. Gene Nygaard 02:49, 7 November 2006 (UTC)
See, for example, SAE Technical Standards Board Standard 003 (TSB-003), May 1999, Rules for SAE Use of SI (Metric) Units"
Quantity | Typical Application | From Old Units | To Metric Units | Multiply by(1) |
---|---|---|---|---|
Temperature interval | General use | °F | K(5) | 1 K = 1 °C = 1.8 °F* |
Footnotes 1. An * indicates an exact conversion factor. |
Note the use of °C for a temperature interval.
See also the use by NIST in its extensive tables of conversion factors in SP811. Gene Nygaard 03:12, 7 November 2006 (UTC)
Gene: There's no misreading. In Res 3 (1967), when they write "the same name and the same symbol are used to express a temperature interval;", they are referring to kelvin. When they write, "a temperature interval may also be expressed in degrees Celsius;" they are referring of course to Celsius and there is nothing in that abrogates what was written in Res 7 (1948) when they state "To indicate a temperature interval or difference, rather than a temperature, the word "degree" in full, or the abbreviation "deg" must be used." One still isn't supposed to write "an increase of 1°"; it's "an increase of one degree." Greg L 18:36, 7 November 2006 (UTC)
See this link for a classic example of how the BIPM uses increments: http://search.bipm.org/cs.html?url=http%3A//kcdb.bipm.org/appendixb/appbresults/CCPR-S2/CCPR-S2_Technical_Protocol.pdf&qt=degree+C&col=bipm&n=2
In it, they report a coefficient of ".0000189 per dgree C " “It is not .0000189 per °C” Greg L 18:47, 7 November 2006 (UTC)
Greg L wrote above "The Web is chock full of documents written by all sorts of otherwise authoritative sources (like NASA). Ultimately, these documents are written by engineers and scientists that were never given a class on how to format temperatures (or forgot it)."
However, none of the examples I gave were from NASA. They were all from the web pages of the BIPM. Gene Nygaard 15:17, 9 November 2006 (UTC)
Is there any article in wikipedia that lists all the temperature scales ordered by the date when they were proposed? If not, should we create one? (Or add it as a section to an existing article?) Itub 14:24, 16 January 2007 (UTC)
Mandel: Your recent edit to the Celsius article had several inaccuracies and needed to be immediately corrected. First, you had mentioned the "freezing point" of water. There is a difference between the melting point and freezing points of water. Although many people consider them to be the same, at the millikelvin level, they are different. Accordingly, precise thermometry experiments used to always use the melting point of water for defining the Celsius scale. Today, ITS-90 makes use almost exclusively of the melting points of various elements. The difference between the two is, of course, defined as whether heat is going into the sample during the measurement (melting) or is going out of the sample (freezing). Secondly, the Celsius scale is only approximately 100 divisions between the melting and boiling points. This is an old, outdated definition; since 1954, the Celsius scale has been defined by two entirely different points. As a result of this new definition, there are, today, only 99.9839 degrees between the melting and boiling points of water. The proper definition of the Celsius is precisely covered by the very next paragraph of the article. There is certainly no need for an outdated and scientifically incorrect "definition" immediately before the paragraph that gives the proper one. Your effort at getting the value "100" into the article may be well-intentioned, but can certainly wait for the very next paragraph, which properly addresses the issue by stating as follows:
Also, Anders Celsius's contribution is overstated when one writes that he developed “the prototype” of the scale. Celsius developed a backwards version of the scale where zero was the boiling point! Accordingly, it's more accurate to state that he developed a "similar" scale. The contribution you made appears that it may have come right out of a textbook of some sort. However, the textbook you chose seems to have been geared to a scientifically entry-level reader and, unfortunately, has several errors and inaccuracies. It was certainly not an encyclopedic resource. Please delete this message at your next convenience. Greg L 04:54, 25 January 2007 (UTC)
Right now the content related to the various articles relating to measurement seems to be rather indifferently handled. This is not good, because at least 45 or so are of a great deal of importance to Wikipedia, and are even regarded as Vital articles. On that basis, I am proposing a new project at Wikipedia:WikiProject Council/Proposals#Measurement to work with these articles, and the others that relate to the concepts of measurement. Any and all input in the proposed project, including indications of willingness to contribute to its work, would be greatly appreciated. Thank you for your attention. John Carter 21:10, 2 May 2007 (UTC)
Shouldn't you use the special Unicode characters, ie.: ℃ - one characater instead of ° followed by uppercase C, ℉ - one character instead of ° followed by uppercase F, K - not exactly the same character as uppercase K, throughout the whole article to add more meaning for machines accessing it? The exception could be paragraphs which describe how not to write degree Celsius (spacing). Are there any compatibility issues with default system fonts? Safari 2.0.4/419.3 on Mac OS X 10.4.9 displays it fine.
This section contains the statement: "Thus, the actual melting point of ice is very slightly (less than a thousandth of a degree) below 0 °C." However, Vienna Standard Mean Ocean Water, to which this article links, says: "Thus, the actual melting point of ice is +0.000 089(10) °C." I am noting this descrepency here as I do not know which is right, and there are no citations in either location. Jjamison 20:18, 11 June 2007 (UTC)
I have a different question about this section. It seems that what should be identical information is included both in this section and in the Use in temperature standards section of the Vienna Standard Mean Ocean Water article. Whenever the same information is repeated in any database, there is always the possibility for that information to become inconsistent. My question is this: How can duplicated information be included in two articles in such a way that only one editable copy exists? Or is it preferable to have that information in one article only and have the other article include only a "see" reference? Howard McCay ( talk) 08:51, 22 December 2010 (UTC)
"For lay-people worldwide — including school textbooks — the full transition from centigrade to Celsius required nearly two decades after this formal adoption." Only two decades (taking us into the 1960s)? I wouldn't be so sure about that! In primary school in the 1980s our teachers in England were still calling it Centigrade. -17:45, 20 August 2007 (UTC)
I agree. Celsius is often only used by those who do weather forcasts or those who are being scientific whereas the general public tend to use centigrade; especially the older generation as this generation were more used to using it than modern youths who are taught "celsius". Often American scientists say "centigrade" as they are more used to using Fahrenheit. Talk To TT' 19:50, 29 January 2008 (UTC) —Preceding unsigned comment added by 84.13.169.44 ( talk)
It really needs some work. Way too long. I am a lemon 23:58, 27 August 2007 (UTC)
The article currently has:
Often in modern days, the word "degrees" is often missed out for example on the BBC weather, the forecaster may read a temperature as "30 celsius" as opposed to "30 degrees celsius".
I would change this to something more concise, and also add mention of misuses of the symobol, e.g..:
Modern news reports often omit (or ' ellipt'?) the word "degrees", such as in a forecast temperature of "30 celsius" instead of "30 degrees celsius". Indeed, for reasons of æsthetics, brevity, ignorance or technical limitations temperatures are often incorrectly written in the form "30C" or "30 C" instead of "30 °C".
...either that or remove it altogether.
— DIV (
128.250.204.118
08:01, 1 September 2007 (UTC))
And see also above at Talk:Celsius/Archive 1#.22Celsiheit.22_and_the_British_media —Preceding unsigned comment added by 128.250.204.118 ( talk) 08:49, 1 September 2007 (UTC)
Did not SI define Celcius as a secondary unit without degrees? That is, the BBC is correct to describe the temperature as 10 C and not 10 °C. —Preceding unsigned comment added by 82.210.237.30 ( talk) 12:16, 23 October 2007 (UTC)
I found this portion of the article that said "the magnitude of the Celsius scale is exactly that of the kelvin scale". Would it be prudent to add the expression Δ °C = Δ K afterwards, to symbolize rate of change? ZtObOr 02:32, 30 January 2008 (UTC)
The first sentence needs some TLC - it doesn't read properly. I'm not sure what to write though. Jake the Editor Man ( talk) 21:31, 13 February 2008 (UTC)
The formatting section on this page appears to conflict with the formatting section on the "Degree Symbol" page.
Quoted from the Celsius page: The general rule is that the numerical value always precedes the unit, and a space is always used to separate the unit from the number, e.g., “23 °C” (not “23°C” nor “23° C”).
Quoted from the Degree Symbol page: However, in many professionally typeset works, including scientific works, such as those published by The University of Chicago Press or Oxford University Press, the degree symbol is printed with no spaces between the number, the symbol, and the C or F representing Celsius or Fahrenheit, as in "10°C".[3] This is also the practice of the University Corporation for Atmospheric Research which operates the National Center for Atmospheric Research.
-- 208.251.98.18 ( talk) 17:51, 18 June 2008 (UTC)rymzon
I was always taught that Centigrade and Celsius were not the same, yet this article says that they are. The difference I was taught was in how their two definition points were different. Centigrade came first (and post-inversion) the scale had the freezing point of water defined as 0 degrees Centigrade, and the boiling point of water defined as 100 degrees centigrade. These were true by definition - as the temperature of these were found with more accuracy the point 0 centigrade was still waters freezing etc (only the relationship with other scales would have changed). Thereby creating a scale with 100 graduations between freezing and boiling. Then after the introduction of Kelvin; a new different scale was created called Celsius whose definition points were Absolute zero being -273.15 Celsius and The freezing point of water being 0 celsius. This means that the two scales are similar - 1 degree Centigrade being 1 degree Celcius, but they are different due to the different points used in defining the scale. Was I taught wrong all the time, despite gaining a UK A-Level in Physics (even if that was quite a few years ago now) 84.65.2.108 ( talk) 15:11, 10 May 2009 (UTC)
If my memory serves, when I was studying engineering in the 1960s, it was common practice to express temperature intervals as "Celsius degrees" (C°), rather than "degrees Celsius (°C), but I cannot now find anything on the web about this. Did that convention actually exist, and was it changed? Peter Chastain ( talk) 12:33, 10 June 2009 (UTC)
I don't remember this from studying engineering in the 70's. However, it's a really neat idea, since "temperature interval" is a different physical quantity to "temperature" and therefore deserves to have a separate name and separate symbol. Right now they are treated as the same unit in the SI, but technical software such as Mathcad and Mathematica implement them as different units. Adamtester ( talk) 00:59, 22 September 2009 (UTC)
I'm studying engineering right now, and one of my textbooks still does it. Maybe someone with more writing skills than me could add it to the article?
Never mind, I made the edit.
-- FrederikVds ( talk) 01:59, 1 June 2011 (UTC)
I don't understand the following sentences:
The "degree Celsius" has been the only SI unit whose full unit name contains an uppercase letter since its SI base unit, the kelvin, became the proper name in 1967 for the obsolete term, the "degree Kelvin". The correct plural form is "degrees Celsius".
and I don't think it's me. Myles325a ( talk) 02:35, 17 November 2009 (UTC)
OP myles back. Ok, this is getting better, but still unclear. To say that "most names of SI units" [are] "never capitalized" is an oxymoron. And your explanation doesn't clear up what all that stuff about 1967 has to do with price of eggs in China. If you can understand it, please make an attempt to turn it into English. As I said, I don't really want to have it explained to me, I want it cleared up so everyone can understand it. At the moment, it is grammatically and stylistically a cracked bowl of alphabet soup. Myles325a ( talk) 03:01, 17 November 2009 (UTC)
In the example that "(1 degree Celsius) plus (1 degree Celsius) = 275.15 degrees Celsius", it is not unexpected if you understand how it works. Addition is defined over Kelvin temperatures, in the same way addition can be defined over integers or real numbers. Addition over Kelvin is different to addition over Celsius due to the different zero (additive identity) element.
As for its suitability for Wikipedia, the link is directly to a primary source without a non-Wikipedia-based explanation of its significance (thus original research). I've removed it. 118.90.87.154 ( talk) 02:19, 22 February 2010 (UTC)
"From 1743 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere with mercury being the working material. Although these defining correlations are commonly taught in schools today, by international agreement the unit "degree Celsius" and the Celsius scale are currently defined by two different temperatures: absolute zero, and the triple point of VSMOW (specially purified water). This definition also precisely relates the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible at which matter reaches minimum entropy, is defined as being precisely 0 K and −273.15 °C. The temperature of the triple point of water is defined as precisely 273.16 K and 0.01 °C.[2]"
This is not as clear to the reader as it could be in telling them the measurement standards for 0 degrees Celsius as they are used today — Preceding unsigned comment added by Banthablaster ( talk • contribs) 03:00, 5 October 2012 (UTC)
Does the conversion chart with half a dozen or more different temperature scales belong in this article or in the article temperature? I think that it belongs in the article temperature. Martinvl ( talk) 21:03, 13 April 2010 (UTC)
It appears that the thermometer in the picture is incorrect as -40 C and -40 F (the point at which Celsius and Fahrenheit are the same) are not in line. Am I just reading it wrong? —Preceding unsigned comment added by Darktangent ( talk • contribs) 01:19, 24 April 2010 (UTC)
This article is somewhat misleading in it's presentation of "Centigrade" as no longer used. This occured to me recently when watching TV News - in two separate news items "Centigrade" was used in statements given by English speaking government representatives. I'm not suggesting any serious changes except perhaps to note that "centigrade" is still in wide use in the English speaking world as a vernacular term. My feeling is that "Celsius" hasn't caught on with "the man in the street". 122.107.58.27 ( talk) 05:54, 24 April 2010 (UTC)
Where I'm from isn't really important, the use of "centigrade" I was referring to were by British and American politicians and were seen on TV news reports on Australian TV. I don't doubt that "Celsius" is used, I am suggesting that "Centigrade" is also widely used in the English speaking world (except Canada). I guess I am saying that the statement '"Centigrade" as no longer used' is an uncited statement. 122.107.58.27 ( talk) 22:24, 17 May 2010 (UTC)
I noticed someone changed "celsius" to "centigrade" in the Sheffield Winter Garden article, so I came here to see if that was appropriate. The article still suggests that "centigrade" is rarely used. If that's not the case, the article should not make that claim. Reach Out to the Truth 17:48, 13 June 2010 (UTC)
When I first loaded this page, I scrolled down to look for conversion factors from Fahrenheit to Celsius, but couldn't find them. I scrolled back up to the top, and it was only then that I noticed the conversion factor table, which was all the way in the top right corner. This means that readers who, like me, assume that the information would be prominent enough that it would in the article, not in the corner of the screen, where is is "out of the way" and less likely to be noticed. Aero-Plex ( talk) 18:18, 10 November 2011 (UTC)
I have read the following sentence more than ten times:
Notwithstanding the official endorsement provided by decision #3 of Resolution 3 of the 13th CGPM, which stated "a temperature interval may also be expressed in degrees Celsius", the practice of simultaneously using both °C and K remains widespread throughout the scientific world as the use of SI prefixed forms of the degree Celsius (such as "µ°C" or "microdegrees Celsius") to express a temperature interval has not been well-adopted.
My English is far from perfect (my native language is Swedish), but it is not that bad and I'm not extremely stupid - however I still do not understand what I supposedly should understand from the the above writing. My guess is that "as the use" should be something like ", while the use"... -- Episcophagus ( talk) 01:57, 2 November 2012 (UTC)
Is the thermometer in the lede calibrated in degrees Celsius? Is the sky blue?
This thermometer was photograpjhed by a German photographer and looks like any thermometer that is sold by the thousand across Germany. Since degrees Celsius is the only temperature scale used in Germany (apart from Kelvins in scientific work), they often do not incorporate "°C" intio the design. Martinvl ( talk) 06:49, 14 December 2012 (UTC)
"Since the 19th century, the scientific and thermometry communities worldwide referred to this scale as the centigrade scale."
In my mind, "Since the 19th century" means "from (and including) the 19th century until today". This is incompatible with the past tense of "refer". "Communities worldwide referred to this scale as...since the 19th century"? This doesn't make sense. We ask the question: "When did communities refer to this scale as the centigrade scale?". The answer will be a time period (not merely a starting point!), such as "from the beginning of the 19th century until recently"; even "for a long time" or "until <decade>" would be acceptable. — Preceding unsigned comment added by 83.248.98.11 ( talk) 12:04, 16 October 2013 (UTC)
The second paragraph of the article at hand begins with, "From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water ..."; nothing too controversial here, but neither the paragraph in question nor the entire article ever gets around to explaining what definitional change was effected in 1954. What happened then - was 0° C redefined as the freezing point of Tanqueray? Was 100° C redefined as the best temperature at which to fry a pork chop? We're left hanging. Such a prominent statement needs to be followed-up on or re-worded; as it is it's annoying and tends to send people like me on unsatisfying, irritating wild-goose chases - not the kind of response Wikipedia seeks to engender I suspect. BLZebubba ( talk) 08:03, 22 October 2015 (UTC)
Regarding the "Melting" point of water... Water does NOT melt! Melt means to turn liquid and water is already a liquid. ICE melts, WATER freezes!
The comment(s) below were originally left at Talk:Celsius/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
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the symbol for degree Celsius displays as a box symbol within the chart on the top right, other places within the text are displayed with the degree symbol and the letter C.
== Chart Is Inaccurate == If you look at the chart in the middle in the article page it is inaccurate. Melting Point Celsius .0001 C isn't correct for 31.99982 °F should be approx -0.8 or -0.9 If 32* F = 0* C...how can 32.018 °F = .01* C? Water Triple Point .01 C isn't correct for 32.018 °F should be 0.1 or 0.2 approx. — Preceding unsigned comment added by 174.124.57.86 ( talk) 23:37, 5 June 2012 (UTC)
http://en.wikipedia.org/wiki/Celsius http://en.wikipedia.org/wiki/Anders_Celsius Regarding date of scale reversal to 0 degrees at the freezing point 1744 in Celsius article and 1745 in Anders_Celsius article 86.150.185.111 ( talk) 19:44, 16 October 2014 (UTC)Ian Turner |
Last edited at 19:44, 16 October 2014 (UTC). Substituted at 11:08, 29 April 2016 (UTC)
While Fahrenheit and Rankine measure degree difference, doesn't Celsius and Kelvin actually measure gradian difference? The difference between the freezing and boiling points of water in Fahrenheit and Rankine is 180, and in Celsius/centigrade and Kelvin is 100, thus Celsius/Kelvin uses the first trigonometric quadrant as the spread, in gradians (0-100ᵍ), while Fahrenheit/Rankine extends the spread out through the second quadrant, in degrees (0-180°). 216.57.137.169 ( talk) 02:19, 9 July 2016 (UTC)
'Celsius measurement follows an interval system but not a ratio system'. Is there any measurement that does follow a ratio system? If so, it should be added. Thanks in advance. Backinstadiums ( talk) 18:37, 16 January 2017 (UTC)
simply we can say: it's 25 Ce[lsi(e)] (read /'selzi:/) {in the rhyme of Curie & Henry} and keep the deg[ron] and its sign as 1/360 of a revolution
Tabascofernandez (
talk)
21:29, 14 July 2017 (UTC)
This article would be better titled Celsius scale, with degree Celsius remaining as a redirect to it. The term "Celsius" does not properly have a meaning as a standalone term, and should perhaps be regarded as slang or shorthand. — Quondum 04:32, 16 July 2017 (UTC)
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Archive 1 |
Real-world examples
-20 Typical freezer 0 Freezing point of water 4 Typical refrigerator 22 Room temperature 30 Temperate climate 37 Body temperature 100 Boiling point of water
1 °C = 1 K, and absolute zero is -273.15 °C
Says the article. Complete nonsense. 1 °C = 274.15 K not 1K. This needs to be fixed.
Jimp 17Oct05
Now it's fixed. Jimp 19Oct05
I think you're either missing the point or deliberately misunderstanding things Jimp.
It is stating that 1 degree on the Kelvin scale is equivalent to 1 degree on the Celsius scale. Which is correct. DurhamMatt
The correct statement is "A change of 1 °C = 1 K"
As a matter of empirical FACT, Fahrenheit is used quite widely in the UK. The Fahrenheit article likewise is WRONG. But hey, who cares about facts when Wikipedia editors decide to push an agenda? — Preceding unsigned comment added by 92.12.18.129 ( talk) 08:25, 3 February 2022 (UTC)
Why is something of tertiary importance to the subject in the 2nd of 7 major sections? Typesetting should be (IMO) just before the references - if included at all. Alanbrowne ( talk) 16:23, 11 May 2013 (UTC)
My research indicates that the original name centigrade came about because there were 100 graduations (steps) between the freezing and boiling points of water, and that the name was changed to Celsius less from a desire to recognise the man himself but more a desire to end confusion caused by:
Don't have conclusive evidence yet though.
Also, NIST and other standards bodies around the world seem to agree that Celsius should always be capitalized when spelt out.
I do not follow why 'centigrade' is confusing. A degree Celsius is 1/100 of a 'grade' between 0 and 100 degrees. Could someone explain this more clearly?
There is a general trend in science to use a captial letter for a proper name, but it is not strict. For example, 5.2Mt is 5.2 mega tonnes. This differentiates milli from mega. Micro uses the Greek letter mu. C is not used elsewhere as a multiplier, so I suspect it always stood for the proper name Celsius. Such details may not lend themselves to historical investigation, unless there was a widespread acceptance of what C stood for. 220.244.75.119 ( talk) 09:08, 28 May 2014 (UTC)
Toby Bartels' explanation is a lot clearer than what is in the article. Ccrrccrr ( talk) 00:49, 6 November 2016 (UTC)
Also, I believe that renaming physical quantities to honor a person, such as 'cycles per second' to 'Hertz', is to me an imposition of human ego on the perfection of the Universe. David 21:10 Apr 27, 2003 (UTC)
No one has ever said '100 megacycle by second'. The correct usage was '100 megacycles'. (The 'per second' was implied.)
We only prefer "Megahertz" now to "megacycles" because we have become used to it. That is how language naturally changes, through common usage. That does not make one term better than another. "Megacycles" is better than "Megahertz", in my opinion, because it is more descriptive of the physics involved. David 16:30 Apr 29, 2003 (UTC)
Yes, the USA, and Jamaica, apparently, are the last holdout for Fahrenheit for everyday, non-scientific temperature measurement, but Wikipedia editors should not parlay their annoyance at this situation into non-NPOV prose. As of today, I've toned down the text in this article and in the Fahrenheit article so that it reads less like commentary. There is no need to mention that Europeans find it "puzzling" that the USA is one of a "declining number of countries" "still" using this system, phrases which together imply fault. - mjb 00:47, 10 Apr 2004 (UTC)
In the United States will stay temperature "Fahrenheit". - Ronald20 18:15, 06 June 2006 (UTC))
Wikipedia could really use a way to let the reader see their own preferred units. Since .org is a USA domain... yup, we like our Fahrenheit. The same goes for any other unit. So how about some Wiki syntax that lets the editor use units they prefer, while not annoying the reader? Otherwise I propose to fix all this senseless Celsius stuff. :-)
Well, if it were any other country in the world, the USA would be among the most prominent to pressure the country to finally adopt to the system every other country is using. JIP | Talk 07:18, 18 May 2007 (UTC)
According to some sources (such as http://susning.nu/Celsius for the fortunate few who read Swedish) Anders Celsius first defined 100 degrees as the temperature at which water freezes and zero degrees as the temperature at which water boils (the advantage of this, I suppose, being that outdoor temperatures would always be in the positive range). Before the scale became used to any measurable extent, however, this was changed to what we're used to today.
If this is true, it should perhaps be noted in the article.
From my science education the original scale had four elements which should all be mentioned: (1) Freezing temperature of water, defined as 0; (2) Boiling temperature of water, defined as 100; (3) Measurement of (1) and (2) at standard atmospheric pressure, sea level, (4) Linear interpolation between 0 and 100 and extrapolation below 0 and above 100. I think it's important to explicitly state the linear nature of the scale, otherwise it is an unstated assumption.
The table is on - http://en.wikipedia.org/wiki/Celsius 2011- 09- 29 — Preceding unsigned comment added by 74.220.169.123 ( talk) 13:59, 29 September 2011 (UTC)
The sentence
"Fahrenheit remains the preferred scale for everyday temperature measurement, although Celsius or kelvin are used for scientific applications."
should either be changed to reflect that it s NOT the preferred scale in Europe or like, or it should be removed.
Actually I don't know of the Fahrenheit use, other than in US.
Don't bother telling that euro anything all the good ones were killed in ww1 and ww2. —Preceding unsigned comment added by 75.187.183.85 ( talk) 22:37, 10 January 2008 (UTC)
Why does the article say: "a method for converting Celsius to Fahrenheit is to add 40, multiply by 1.8, and subtract 40." etc. (huh??)
...but the sidebar says: °F = °C × 1.8 + 32
johnq 09:20, Dec 29, 2004 (UTC)
The article currently seems to spell celsius with a captial letter when refering to the measurement of temperature. I always thought the general rule was that when units are named after a person then when the full name is spelt out there is no capitalisation, however when just the initial of the unit is used then it is in capitals. So for example you would write 10 degrees celsius or 10 °C. The units watt, joule, volt, newton, farad, henry and tesla all seem to follow this rule. Is there an exception for celsius? or is the article wrong? -- Popsracer 02:15, 25 Jan 2005 (UTC)
When was celsius redefined in terms of kelvin? The article doesn't say. — Ævar Arnfjörð Bjarmason 07:39, 2005 Mar 15 (UTC)
I removed this section from the article because it does not seem to be in common usage - a Google search revealed only one reputable use, on the UK Metric Association's website.
I also removed the above. Whilst this is an interesting indicator of the increasing innumeracy of the British public, it doesn't seem specifically relevant on a page about the Celsius scale.
-- Hex 13:36, 30 May 2005 (UTC)
I seem to remember when the BBC changed from using centigrade to celsius in weather forecasts that the explanation was that they were not the same. Centigrade was defined by graduating the points for 0 and 100 on a particular measuring device into 100 equal parts, whereas celsius was done by graduating between 0 and 100 with 100 equal temperature changes. These two would be different if the expansion of the say liquid in the device was not uniform over the range 0 to 100. Is my memory faulty or the explanation or both? Bornintheguz 1 July 2005 18:44 (UTC)
Before the 9th CGPM, 1948, Celsius and Centigrade were both used to denote the same unit of temperature defined by the freezing and boiling points of water. In 1948 the unit was re-defined based on the triple point of water and at the same time its name was standardised to Celsius. It then appears that Centigrade was never the correct term for the new definition. I then guess that technically, if mentioning degrees Centigrade, one should be referring to the temperature as measured before 1948, which would then imply the old scale. -- Brunik ( talk) 12:09, 3 March 2009 (UTC)
Actually that's not entirely true.. The Kelvin is the SI unit of tempertaure based on the ideal gas equation, a linear scale relating to the tripple point of water (273.15 by definition) and can only occur at one value of P and T and such is reproducible internationally.
The ice point is the temperature at which ice and air-saturated water co-exist at equilibrium at a pressure of 1 atm. The centigrade scale gave 0 degrees at the ice point of water and 100 degrees at the steam point and was a function with 100 grades between the two points. The steam and ice points were hard to reproduce sufficiently accurately so the celcius scale was devised which was based on the same grading as the original centigrade scale but used the tripple point of water as the fixed point and had the same grading as the centigrade scale, this gives an ice point of 0C and a steam point of 99.97C. - Thermodynamics can be pedantic!
I've changed the opening line to include historically, since centigrade and Celsius are not the same, with a reference to it. Please do not revert!! Discuss here. I understand the Encyclopedia Britannica says one thing, but to be honest it's clear they just wrote that out without due process of the differentiation. Of course, edit to clarify but the intent is to maintain that "centigrade" is not and should not be used as a measurement unit. Cpt ricard ( talk) 00:40, 17 March 2015 (UTC)
Since the name of the unit is "degree Celsius", shouldn't the article be moved there? I hesitate because it implies a lot of redirect checking...
Urhixidur 12:48, 2005 July 28 (UTC)
I changed it from reading "an SI unit" to simply "a unit" given that it isn't technically an SI unit. If I am off-base, that is fine, but as I understand it, kelvins are the only SI units of temperature. Tmrobertson 05:14, 5 November 2005 (UTC)
And I changed it again to an " SI derived unit" based on what has been already established in the SI page. Sorry if I covered old ground. Tmrobertson 05:18, 5 November 2005 (UTC)
On 2005-09-11 12:39:50 Bobblewik "copyedited" the article from this to this diff, since then the article has in my opionion gotten drastically worse. For instance it now claims in the first paragraph that the unit is defined with the freezing point of water at 0 degrees and the boiling point at 100 degrees, but in reality the unit hasn't had a definition that's anything like that since 1954!, and even before then it was 0 and 100 at standard atmospheric pressure. That's not the only problem with that version however, it split content into multiple sections that could easily have fitted as prose in the first paragraph etc. — Ævar Arnfjörð Bjarmason 20:43, 21 November 2005 (UTC)
IF and ONLY IF Wikipedia is "aiming" at scientists and engineers, then yes - I would agree with you. The fact is that Wikipedia is not meant strictly for engineers and scientists, and in general - when people come to Wikipedia, they are looking for common answers to common questions. Therefore, the definitions of 0 deg C (freezing) and 100 deg C (boiling) are PERFECTLY ADEQUATE and appropriate. This scientific "look how smart I am" nit picking over and re-writing of articles has GOT to stop. Very few people in the real world care about .01 deg Celsius, or the 1948 ... blah blah history of how the units are defined, limits, boundaries, etc. IF they do, then let them drill down to the appropriate section wherein you all can flex your superior intellectual powers and show that, indeed, you know all about the Celsius temperature scale. I get tired of having to come here and write these rants discouraging bad behavior. In its most vulgar form, it is nothing more than a bad case of Intellectual Elitism. Wikipedia has slowly been taken over by people who seem to be stricken with Asperger's Syndrome. For those of you who need to continually display your intellect, might I suggest a return to academia, where you can publish inane articles to your heart's content; and to the amazement of your friends and colleagues. Here in Wikipedia land, it just puts people off and discourages them from reading. Which is a BAD THING. tjp in Houston — Preceding
unsigned comment added by
98.194.39.86 (
talk)
22:42, 19 June 2016 (UTC)
Who is "Christian of Lyons" - it sound like a medieval person. : ) "Elvius from Sweden" is almost certainly Pehr Elvius the Elder, who was one of the predecessors of Celsius in the Uppsala chair of Physics, as well as his uncle by marriage. But in the bios I find on Elvius, I see nothing connected to this issue. The history section needs checking and referencing. up◦land 09:40, 10 December 2005 (UTC)
Please see the discussion at Talk:Units of measurement because it affects several units of measurement. bobblewik 22:03, 12 February 2006 (UTC)
In the United States will switch from Fahrenheit to Celsius. Ronald20 20:00, 10 June 2006 (UTC)
However, in the United States not yet switched to temperature Celsius. They still used a temperature Fahrenheit. Ronald20 18:21, 15 June 2006 (UTC)
A pedantic objection, perhaps:
According to the table, the freezing point of water is "0" and the boiling point is "100" on the Celsius scale. This would suggest one of two things: either (a) these temperatures are EXACT, by definition, or (b) they are only known to the nearest one degree. Neither is true. I don't know whether anyone has measured the freezing and boiling points of water (at standard pressure) with enough precision to distinguish the "new" scale from the "old" one; I searched on Google for a while and couldn't find anything. But naively I would expect any deviation to occur around the 3rd decimal place, since absolute zero and the triple point are defined at two decimal places (i.e. the freezing point of water at standard pressure is likely to be 0.00x or -0.00x, where x is some non-zero digit).
To avoid this ambiguity, I would suggest changing the freezing and boiling points to 0.00 and 100.00, unless someone can find an accurate authoritative measurement. Mtford 04:07, 19 June 2006 (UTC)
I've been trying to find a reference for the fact that the scale was reversed, and I've been running into some inconsistencies. I haven't found anything really authoritative (in many cases it's just a footnote), and different books give different dates and authors of the reversal. I found these searching for "celsius 1744 reversed" and "celsius reversed" in Google Books. Here are some results:
I found some old books about Celsius in my university library, but all of them seem to be in Swedish, which I don't read. Itub 18:51, 19 July 2006 (UTC)
I searched "Jean Pierre Christin" and found this book "A Chronology of Microbiology in Historical Context" which claims Christin inverted it in 1743. Ctchou 13:23, 16 April 2007 (UTC)
I just checked the SI page, and it doesnt seem like degrees Celsius is a SI unit at all - kelvin is, Celsius is just a common unit. Am I wrong? Yarilo2 03:15, 22 September 2006 (UTC)
·Never mind. I see now that degree celsius is not a unit of SI but rather a derived unit of SI, which still counts. Cheers, Yarilo2 03:24, 22 September 2006 (UTC)
Someone needs to carefully look at the history section and correct it if necessary. The information (misinformation?) there keeps getting repeated on the Internet by other sources that simply copy what Wikipedia says. I'm not going to do it because I don't have the stomach for the holy wars that result from wholesale deletions of information; even when it's completely incorrect. First, the un-cited claim that botanist Carolus Linnaeus was not responsible for reversing Celsius' scale to its current form is contrary to authoritative sources such as Thermodynamics-information.net: A Brief History of Temperature Measurement and, Uppsala University (Sweden): Linnaeus’ thermometer. That second reference is the botany school that Linnaeus founded. Furthermore, the notion that water's boiling point would be defined at a pressure of only 1000 mbar is highly suspect. Such a pressure (as opposed to the median seal-level value of 1013.25 mbar) would produce a boiling point on today's Celsius scale of 99.632 °C. This flies in the face of the practical reality of the time: Paris, where many of these standards were set, is only about 45 to 58 meters above sea level. All the modern SI work (acceleration of gravity, densities, temperatures) were originally predicated upon sea-level pressure at the latitude of Paris. Water's boiling point has always been defined at one standard atmosphere. As far as I know, this "1000 mbar" idea is the modern product of a 1985 IUPAC decision for measuring the physical properties of substances including the chemical elements. Greg L 02:58, 5 October 2006 (UTC)
As it was written: “Throughout the world (except for the U.S.), the Celsius scale is used for most temperature measuring purposes. The entire scientific world (the U.S. included) uses the Celsius and Kelvin scales. Many engineering fields in the U.S., especially high-tech ones, also use the Celsius scale. The bulk of the U.S. however, (its lay people, industry, meteorology, and government) relies upon the Fahrenheit scale. Jamaica is currently converting to Celsius.” …it doesn't make sense to mention the Kelvin scale for science if all the other scales for the other uses aren't also disclosed. One begins running off on a tangent by introducing the subject of a thermodynamic scale (kelvin) which isn't the subject of this article. Completing these tangencies all the way for consistency results in a paragraph that reads as follows:
The whole point of this paragraph is to address who's using the Celsius scale. That's why the sentence regarding the scientific world would properly tell that it uses the Celsius scale—not that it measures temperature exclusively with the Celsius scale; just that it uses it. In the case of the lay person in the U.S., Fahrenheit must necessarily be discussed simply because of the conspicuous fact that the Celsius isn't used for this widespread audience. For logical consistency, the most straightforward wording for where the Celsius scale is used is as follows (emphasis added here only):
The above: “The entire scientific world (the U.S. included) uses the Celsius scale.” is an absolutely true statement and properly sticks to the simple subject of who is using the Celsius scale. As written, this paragaph doesn't try to pretend to enumerate every scale currently being used for these different disciplines. Greg L 04:35, 13 October 2006 (UTC)
Vandalism doesn't always go unpunished. The IP address (208.220.136.66) from which some contributors vandalized this Celsius article traced back to The Potomac School in Virginia. It's a fine, K-12 private school three miles from Washington D.C. There was something about the nature of the vandalism (including this choice entry: “everybody is a gay fagg in the world”) that led me to feel grown-ups ought to know about it. So I informed the school’s officials. Through fortuitous timing, I happened to have contacted the school’s authorities roughly three hours after it happened. I received the following reply from a school administrator several hours later:
I appreciate everyone's work on this. I have spoken to the boy who admits to being the author of two of the quotes, and he has mentioned another boy who I will speak to tomorrow. He is probably reponsible for the third quote. The only question is regarding quote number 2, but I expect that they will provide that information tomorrow. Please rest assured that there will be serious consequences for all involved. I really appreciate your quick action in letting us know.
The part that's noteworthy about this is that this kid was confronted in a Virginia private school about four hours after he anonymously committed some vandalism to an article on the Web. If I was a ninth-grader and this happened to me, I'd sure be shocked. Signed: [Anonymous (to help avoid other acts of vandalism) on Wednesday, October 18, 2006 at 21:52]
The statements that I just took out, but probably haven't completely fixed yet, about the usage for temperature intervals, indicate a gross misunderstanding of the actual resolution of the 13th CGPM, especially the point number 2:
1. the unit of thermodynamic temperature is denoted by the name “kelvin” and its symbol is “K”;
2. the same name and the same symbol are used to express a temperature interval;
3. a temperature interval may also be expressed in degrees Celsius;
4. the decisions mentioned in the opening paragraph concerning the name of the unit of thermodynamic temperature, its symbol and the designation of the unit to express an interval or a difference of temperatures are abrogated, but the usages which derive from these decisions remain permissible for the time being.
Even though it comes before point 3, rule 2 applies to it as well. The proper, current symbol is °C, in any context, whether a temperature reading or a temperature interval. The 1948 rules were "abrogated" in the legalese of this 1967-68 resolution. Gene Nygaard 02:47, 7 November 2006 (UTC)
In other words, a big part of the whole philosophy of this resolution was the clarification that the "thermodynamic temperature" and a "temperature interval" are not really different things. So let's not try to step back into the past in our article here. Gene Nygaard 02:49, 7 November 2006 (UTC)
See, for example, SAE Technical Standards Board Standard 003 (TSB-003), May 1999, Rules for SAE Use of SI (Metric) Units"
Quantity | Typical Application | From Old Units | To Metric Units | Multiply by(1) |
---|---|---|---|---|
Temperature interval | General use | °F | K(5) | 1 K = 1 °C = 1.8 °F* |
Footnotes 1. An * indicates an exact conversion factor. |
Note the use of °C for a temperature interval.
See also the use by NIST in its extensive tables of conversion factors in SP811. Gene Nygaard 03:12, 7 November 2006 (UTC)
Gene: There's no misreading. In Res 3 (1967), when they write "the same name and the same symbol are used to express a temperature interval;", they are referring to kelvin. When they write, "a temperature interval may also be expressed in degrees Celsius;" they are referring of course to Celsius and there is nothing in that abrogates what was written in Res 7 (1948) when they state "To indicate a temperature interval or difference, rather than a temperature, the word "degree" in full, or the abbreviation "deg" must be used." One still isn't supposed to write "an increase of 1°"; it's "an increase of one degree." Greg L 18:36, 7 November 2006 (UTC)
See this link for a classic example of how the BIPM uses increments: http://search.bipm.org/cs.html?url=http%3A//kcdb.bipm.org/appendixb/appbresults/CCPR-S2/CCPR-S2_Technical_Protocol.pdf&qt=degree+C&col=bipm&n=2
In it, they report a coefficient of ".0000189 per dgree C " “It is not .0000189 per °C” Greg L 18:47, 7 November 2006 (UTC)
Greg L wrote above "The Web is chock full of documents written by all sorts of otherwise authoritative sources (like NASA). Ultimately, these documents are written by engineers and scientists that were never given a class on how to format temperatures (or forgot it)."
However, none of the examples I gave were from NASA. They were all from the web pages of the BIPM. Gene Nygaard 15:17, 9 November 2006 (UTC)
Is there any article in wikipedia that lists all the temperature scales ordered by the date when they were proposed? If not, should we create one? (Or add it as a section to an existing article?) Itub 14:24, 16 January 2007 (UTC)
Mandel: Your recent edit to the Celsius article had several inaccuracies and needed to be immediately corrected. First, you had mentioned the "freezing point" of water. There is a difference between the melting point and freezing points of water. Although many people consider them to be the same, at the millikelvin level, they are different. Accordingly, precise thermometry experiments used to always use the melting point of water for defining the Celsius scale. Today, ITS-90 makes use almost exclusively of the melting points of various elements. The difference between the two is, of course, defined as whether heat is going into the sample during the measurement (melting) or is going out of the sample (freezing). Secondly, the Celsius scale is only approximately 100 divisions between the melting and boiling points. This is an old, outdated definition; since 1954, the Celsius scale has been defined by two entirely different points. As a result of this new definition, there are, today, only 99.9839 degrees between the melting and boiling points of water. The proper definition of the Celsius is precisely covered by the very next paragraph of the article. There is certainly no need for an outdated and scientifically incorrect "definition" immediately before the paragraph that gives the proper one. Your effort at getting the value "100" into the article may be well-intentioned, but can certainly wait for the very next paragraph, which properly addresses the issue by stating as follows:
Also, Anders Celsius's contribution is overstated when one writes that he developed “the prototype” of the scale. Celsius developed a backwards version of the scale where zero was the boiling point! Accordingly, it's more accurate to state that he developed a "similar" scale. The contribution you made appears that it may have come right out of a textbook of some sort. However, the textbook you chose seems to have been geared to a scientifically entry-level reader and, unfortunately, has several errors and inaccuracies. It was certainly not an encyclopedic resource. Please delete this message at your next convenience. Greg L 04:54, 25 January 2007 (UTC)
Right now the content related to the various articles relating to measurement seems to be rather indifferently handled. This is not good, because at least 45 or so are of a great deal of importance to Wikipedia, and are even regarded as Vital articles. On that basis, I am proposing a new project at Wikipedia:WikiProject Council/Proposals#Measurement to work with these articles, and the others that relate to the concepts of measurement. Any and all input in the proposed project, including indications of willingness to contribute to its work, would be greatly appreciated. Thank you for your attention. John Carter 21:10, 2 May 2007 (UTC)
Shouldn't you use the special Unicode characters, ie.: ℃ - one characater instead of ° followed by uppercase C, ℉ - one character instead of ° followed by uppercase F, K - not exactly the same character as uppercase K, throughout the whole article to add more meaning for machines accessing it? The exception could be paragraphs which describe how not to write degree Celsius (spacing). Are there any compatibility issues with default system fonts? Safari 2.0.4/419.3 on Mac OS X 10.4.9 displays it fine.
This section contains the statement: "Thus, the actual melting point of ice is very slightly (less than a thousandth of a degree) below 0 °C." However, Vienna Standard Mean Ocean Water, to which this article links, says: "Thus, the actual melting point of ice is +0.000 089(10) °C." I am noting this descrepency here as I do not know which is right, and there are no citations in either location. Jjamison 20:18, 11 June 2007 (UTC)
I have a different question about this section. It seems that what should be identical information is included both in this section and in the Use in temperature standards section of the Vienna Standard Mean Ocean Water article. Whenever the same information is repeated in any database, there is always the possibility for that information to become inconsistent. My question is this: How can duplicated information be included in two articles in such a way that only one editable copy exists? Or is it preferable to have that information in one article only and have the other article include only a "see" reference? Howard McCay ( talk) 08:51, 22 December 2010 (UTC)
"For lay-people worldwide — including school textbooks — the full transition from centigrade to Celsius required nearly two decades after this formal adoption." Only two decades (taking us into the 1960s)? I wouldn't be so sure about that! In primary school in the 1980s our teachers in England were still calling it Centigrade. -17:45, 20 August 2007 (UTC)
I agree. Celsius is often only used by those who do weather forcasts or those who are being scientific whereas the general public tend to use centigrade; especially the older generation as this generation were more used to using it than modern youths who are taught "celsius". Often American scientists say "centigrade" as they are more used to using Fahrenheit. Talk To TT' 19:50, 29 January 2008 (UTC) —Preceding unsigned comment added by 84.13.169.44 ( talk)
It really needs some work. Way too long. I am a lemon 23:58, 27 August 2007 (UTC)
The article currently has:
Often in modern days, the word "degrees" is often missed out for example on the BBC weather, the forecaster may read a temperature as "30 celsius" as opposed to "30 degrees celsius".
I would change this to something more concise, and also add mention of misuses of the symobol, e.g..:
Modern news reports often omit (or ' ellipt'?) the word "degrees", such as in a forecast temperature of "30 celsius" instead of "30 degrees celsius". Indeed, for reasons of æsthetics, brevity, ignorance or technical limitations temperatures are often incorrectly written in the form "30C" or "30 C" instead of "30 °C".
...either that or remove it altogether.
— DIV (
128.250.204.118
08:01, 1 September 2007 (UTC))
And see also above at Talk:Celsius/Archive 1#.22Celsiheit.22_and_the_British_media —Preceding unsigned comment added by 128.250.204.118 ( talk) 08:49, 1 September 2007 (UTC)
Did not SI define Celcius as a secondary unit without degrees? That is, the BBC is correct to describe the temperature as 10 C and not 10 °C. —Preceding unsigned comment added by 82.210.237.30 ( talk) 12:16, 23 October 2007 (UTC)
I found this portion of the article that said "the magnitude of the Celsius scale is exactly that of the kelvin scale". Would it be prudent to add the expression Δ °C = Δ K afterwards, to symbolize rate of change? ZtObOr 02:32, 30 January 2008 (UTC)
The first sentence needs some TLC - it doesn't read properly. I'm not sure what to write though. Jake the Editor Man ( talk) 21:31, 13 February 2008 (UTC)
The formatting section on this page appears to conflict with the formatting section on the "Degree Symbol" page.
Quoted from the Celsius page: The general rule is that the numerical value always precedes the unit, and a space is always used to separate the unit from the number, e.g., “23 °C” (not “23°C” nor “23° C”).
Quoted from the Degree Symbol page: However, in many professionally typeset works, including scientific works, such as those published by The University of Chicago Press or Oxford University Press, the degree symbol is printed with no spaces between the number, the symbol, and the C or F representing Celsius or Fahrenheit, as in "10°C".[3] This is also the practice of the University Corporation for Atmospheric Research which operates the National Center for Atmospheric Research.
-- 208.251.98.18 ( talk) 17:51, 18 June 2008 (UTC)rymzon
I was always taught that Centigrade and Celsius were not the same, yet this article says that they are. The difference I was taught was in how their two definition points were different. Centigrade came first (and post-inversion) the scale had the freezing point of water defined as 0 degrees Centigrade, and the boiling point of water defined as 100 degrees centigrade. These were true by definition - as the temperature of these were found with more accuracy the point 0 centigrade was still waters freezing etc (only the relationship with other scales would have changed). Thereby creating a scale with 100 graduations between freezing and boiling. Then after the introduction of Kelvin; a new different scale was created called Celsius whose definition points were Absolute zero being -273.15 Celsius and The freezing point of water being 0 celsius. This means that the two scales are similar - 1 degree Centigrade being 1 degree Celcius, but they are different due to the different points used in defining the scale. Was I taught wrong all the time, despite gaining a UK A-Level in Physics (even if that was quite a few years ago now) 84.65.2.108 ( talk) 15:11, 10 May 2009 (UTC)
If my memory serves, when I was studying engineering in the 1960s, it was common practice to express temperature intervals as "Celsius degrees" (C°), rather than "degrees Celsius (°C), but I cannot now find anything on the web about this. Did that convention actually exist, and was it changed? Peter Chastain ( talk) 12:33, 10 June 2009 (UTC)
I don't remember this from studying engineering in the 70's. However, it's a really neat idea, since "temperature interval" is a different physical quantity to "temperature" and therefore deserves to have a separate name and separate symbol. Right now they are treated as the same unit in the SI, but technical software such as Mathcad and Mathematica implement them as different units. Adamtester ( talk) 00:59, 22 September 2009 (UTC)
I'm studying engineering right now, and one of my textbooks still does it. Maybe someone with more writing skills than me could add it to the article?
Never mind, I made the edit.
-- FrederikVds ( talk) 01:59, 1 June 2011 (UTC)
I don't understand the following sentences:
The "degree Celsius" has been the only SI unit whose full unit name contains an uppercase letter since its SI base unit, the kelvin, became the proper name in 1967 for the obsolete term, the "degree Kelvin". The correct plural form is "degrees Celsius".
and I don't think it's me. Myles325a ( talk) 02:35, 17 November 2009 (UTC)
OP myles back. Ok, this is getting better, but still unclear. To say that "most names of SI units" [are] "never capitalized" is an oxymoron. And your explanation doesn't clear up what all that stuff about 1967 has to do with price of eggs in China. If you can understand it, please make an attempt to turn it into English. As I said, I don't really want to have it explained to me, I want it cleared up so everyone can understand it. At the moment, it is grammatically and stylistically a cracked bowl of alphabet soup. Myles325a ( talk) 03:01, 17 November 2009 (UTC)
In the example that "(1 degree Celsius) plus (1 degree Celsius) = 275.15 degrees Celsius", it is not unexpected if you understand how it works. Addition is defined over Kelvin temperatures, in the same way addition can be defined over integers or real numbers. Addition over Kelvin is different to addition over Celsius due to the different zero (additive identity) element.
As for its suitability for Wikipedia, the link is directly to a primary source without a non-Wikipedia-based explanation of its significance (thus original research). I've removed it. 118.90.87.154 ( talk) 02:19, 22 February 2010 (UTC)
"From 1743 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere with mercury being the working material. Although these defining correlations are commonly taught in schools today, by international agreement the unit "degree Celsius" and the Celsius scale are currently defined by two different temperatures: absolute zero, and the triple point of VSMOW (specially purified water). This definition also precisely relates the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible at which matter reaches minimum entropy, is defined as being precisely 0 K and −273.15 °C. The temperature of the triple point of water is defined as precisely 273.16 K and 0.01 °C.[2]"
This is not as clear to the reader as it could be in telling them the measurement standards for 0 degrees Celsius as they are used today — Preceding unsigned comment added by Banthablaster ( talk • contribs) 03:00, 5 October 2012 (UTC)
Does the conversion chart with half a dozen or more different temperature scales belong in this article or in the article temperature? I think that it belongs in the article temperature. Martinvl ( talk) 21:03, 13 April 2010 (UTC)
It appears that the thermometer in the picture is incorrect as -40 C and -40 F (the point at which Celsius and Fahrenheit are the same) are not in line. Am I just reading it wrong? —Preceding unsigned comment added by Darktangent ( talk • contribs) 01:19, 24 April 2010 (UTC)
This article is somewhat misleading in it's presentation of "Centigrade" as no longer used. This occured to me recently when watching TV News - in two separate news items "Centigrade" was used in statements given by English speaking government representatives. I'm not suggesting any serious changes except perhaps to note that "centigrade" is still in wide use in the English speaking world as a vernacular term. My feeling is that "Celsius" hasn't caught on with "the man in the street". 122.107.58.27 ( talk) 05:54, 24 April 2010 (UTC)
Where I'm from isn't really important, the use of "centigrade" I was referring to were by British and American politicians and were seen on TV news reports on Australian TV. I don't doubt that "Celsius" is used, I am suggesting that "Centigrade" is also widely used in the English speaking world (except Canada). I guess I am saying that the statement '"Centigrade" as no longer used' is an uncited statement. 122.107.58.27 ( talk) 22:24, 17 May 2010 (UTC)
I noticed someone changed "celsius" to "centigrade" in the Sheffield Winter Garden article, so I came here to see if that was appropriate. The article still suggests that "centigrade" is rarely used. If that's not the case, the article should not make that claim. Reach Out to the Truth 17:48, 13 June 2010 (UTC)
When I first loaded this page, I scrolled down to look for conversion factors from Fahrenheit to Celsius, but couldn't find them. I scrolled back up to the top, and it was only then that I noticed the conversion factor table, which was all the way in the top right corner. This means that readers who, like me, assume that the information would be prominent enough that it would in the article, not in the corner of the screen, where is is "out of the way" and less likely to be noticed. Aero-Plex ( talk) 18:18, 10 November 2011 (UTC)
I have read the following sentence more than ten times:
Notwithstanding the official endorsement provided by decision #3 of Resolution 3 of the 13th CGPM, which stated "a temperature interval may also be expressed in degrees Celsius", the practice of simultaneously using both °C and K remains widespread throughout the scientific world as the use of SI prefixed forms of the degree Celsius (such as "µ°C" or "microdegrees Celsius") to express a temperature interval has not been well-adopted.
My English is far from perfect (my native language is Swedish), but it is not that bad and I'm not extremely stupid - however I still do not understand what I supposedly should understand from the the above writing. My guess is that "as the use" should be something like ", while the use"... -- Episcophagus ( talk) 01:57, 2 November 2012 (UTC)
Is the thermometer in the lede calibrated in degrees Celsius? Is the sky blue?
This thermometer was photograpjhed by a German photographer and looks like any thermometer that is sold by the thousand across Germany. Since degrees Celsius is the only temperature scale used in Germany (apart from Kelvins in scientific work), they often do not incorporate "°C" intio the design. Martinvl ( talk) 06:49, 14 December 2012 (UTC)
"Since the 19th century, the scientific and thermometry communities worldwide referred to this scale as the centigrade scale."
In my mind, "Since the 19th century" means "from (and including) the 19th century until today". This is incompatible with the past tense of "refer". "Communities worldwide referred to this scale as...since the 19th century"? This doesn't make sense. We ask the question: "When did communities refer to this scale as the centigrade scale?". The answer will be a time period (not merely a starting point!), such as "from the beginning of the 19th century until recently"; even "for a long time" or "until <decade>" would be acceptable. — Preceding unsigned comment added by 83.248.98.11 ( talk) 12:04, 16 October 2013 (UTC)
The second paragraph of the article at hand begins with, "From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water ..."; nothing too controversial here, but neither the paragraph in question nor the entire article ever gets around to explaining what definitional change was effected in 1954. What happened then - was 0° C redefined as the freezing point of Tanqueray? Was 100° C redefined as the best temperature at which to fry a pork chop? We're left hanging. Such a prominent statement needs to be followed-up on or re-worded; as it is it's annoying and tends to send people like me on unsatisfying, irritating wild-goose chases - not the kind of response Wikipedia seeks to engender I suspect. BLZebubba ( talk) 08:03, 22 October 2015 (UTC)
Regarding the "Melting" point of water... Water does NOT melt! Melt means to turn liquid and water is already a liquid. ICE melts, WATER freezes!
The comment(s) below were originally left at Talk:Celsius/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
Comment(s) | Press [show] to view → |
---|---|
the symbol for degree Celsius displays as a box symbol within the chart on the top right, other places within the text are displayed with the degree symbol and the letter C.
== Chart Is Inaccurate == If you look at the chart in the middle in the article page it is inaccurate. Melting Point Celsius .0001 C isn't correct for 31.99982 °F should be approx -0.8 or -0.9 If 32* F = 0* C...how can 32.018 °F = .01* C? Water Triple Point .01 C isn't correct for 32.018 °F should be 0.1 or 0.2 approx. — Preceding unsigned comment added by 174.124.57.86 ( talk) 23:37, 5 June 2012 (UTC)
http://en.wikipedia.org/wiki/Celsius http://en.wikipedia.org/wiki/Anders_Celsius Regarding date of scale reversal to 0 degrees at the freezing point 1744 in Celsius article and 1745 in Anders_Celsius article 86.150.185.111 ( talk) 19:44, 16 October 2014 (UTC)Ian Turner |
Last edited at 19:44, 16 October 2014 (UTC). Substituted at 11:08, 29 April 2016 (UTC)
While Fahrenheit and Rankine measure degree difference, doesn't Celsius and Kelvin actually measure gradian difference? The difference between the freezing and boiling points of water in Fahrenheit and Rankine is 180, and in Celsius/centigrade and Kelvin is 100, thus Celsius/Kelvin uses the first trigonometric quadrant as the spread, in gradians (0-100ᵍ), while Fahrenheit/Rankine extends the spread out through the second quadrant, in degrees (0-180°). 216.57.137.169 ( talk) 02:19, 9 July 2016 (UTC)
'Celsius measurement follows an interval system but not a ratio system'. Is there any measurement that does follow a ratio system? If so, it should be added. Thanks in advance. Backinstadiums ( talk) 18:37, 16 January 2017 (UTC)
simply we can say: it's 25 Ce[lsi(e)] (read /'selzi:/) {in the rhyme of Curie & Henry} and keep the deg[ron] and its sign as 1/360 of a revolution
Tabascofernandez (
talk)
21:29, 14 July 2017 (UTC)
This article would be better titled Celsius scale, with degree Celsius remaining as a redirect to it. The term "Celsius" does not properly have a meaning as a standalone term, and should perhaps be regarded as slang or shorthand. — Quondum 04:32, 16 July 2017 (UTC)
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