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This article states "one atmosphere is exactly equal to 1013.25 hPa.' This is the International Standard Atmosphere (ISA) which is used to calibrate instruments at certain temperatures and pressures. One Atmosphere is still 1000 hPa. -- Metricmike ( talk) 01:43, 9 April 2010 (UTC)
The article states "It is a measure of force per unit area i.e. equivalent to one newton per square meter or one joule per cubic meter.". A unit of force per unit area is not what's expressed as "one joule per cubic meter". A cubic meter is not an area. This should be cleared up. —Preceding unsigned comment added by 192.35.35.34 ( talk) 19:59, 2 April 2009 (UTC)
Neither a joule is a newton, pressure is a force per unit area but also an energy density and a J/m^3=N*m/m^3. It's actually correct and worth stressing more. Think for example at the perfect gas law PV=NkT, p=NkT/V, an energy density. 79.21.143.99 ( talk) 14:18, 16 April 2015 (UTC)
This artical say it is 1 kPa. The mars article says it is 0.1 kPa. One of these is wrong. My understanding is that it is 0.7-0.9 kPa which is just slightly above the point where water cannot exist in the liquid phase. Can those who made the wrong example make a correction? -- Terrell Larson
Blaise Pascal was an important mathematician, but Galileo Galilei was the first person to weigh the atmosphere. The unit of atmospheric pressure (perhaps) should be the Galileo, not the hectopascal. Pascal didn't do much in the area of weighing the atmosphere. Millibar is the best term, though. Trudy June 28th, 2005 11:03 Z
1 pascal (Pa) = 1 N/m2 = 1 J/m3 = 1 kg·m–1·s–2
Are you sure that it's " 1 kg·m–1·s–2 " without such thing as an area? that's only Mass/Acceleration...
Sorry to be such a novice/unwitting terrorist, but I made a change to the page and didn't include links or anything like that. I added that the Pa is equal to one Joule/m^3 since I think that's important. I also apologize for sticking this comment here, but I didn't think it warranted a new section.
I wanted to know what a "pascal" was? So I came to wikipedia to find out. I read the write up on "pascal" and still do not know what a pascal is?
In order to completely understand what a "pascal" is, it is necessary to explain why Mr. Pascal first decided to use that unit of measurement. What reference point did he first use and why?
What is one pascal equal to in the physical universe?
Or how did he arrive at what we know as one "pascal"?
I expect it to be something simple.
Something that an elementary student could understand.
For example 0 degrees celcius is where water freezes and 100 degrees is where water boils. (Or in degrees kelvin, 0 is where everything freezes and stops.)
When those reference points are known then, degrees celcius (and kelvin) means something.
If it meant that one pascal was equal to the atmospheric pressure at sea level, then it would mean something.
That is simple. It is a reference point. It is something a person can wrap his mind around. It is an anchor point. Otherwise it is ambiguous.
Would someone who knows this stuff please include it in the write up on "pascal"?
Diogeneseii ( talk) 21:41, 8 June 2014 (UTC) Diogeneseii
messurment: of compressed energy in meter cubic.
What???? Peter Horn 03:23, 1 September 2006 (UTC)
100 000 Pa devided by 101 325 Pa gives 750.062, not exactly 750 . Peter Horn 03:23, 1 September 2006 (UTC)
The result of the debate was PAGE MOVED per discussion below. - GTBacchus( talk) 20:38, 17 September 2006 (UTC)
Instead of directing here when searching for "Pascal", I think it should first go to the article on Pascal the person.
Sorry I missed the discussion of the proposed move; I think it was a damn foolish idea.
But since it was moved, who is going to now step in and fix the 500 links to a disambiguation page at Pascal (click on What links here? for that page), and ensure that they go to the right article, rather than linking to a disambiguation page?
Some things, such as redirects from
㎫, are no-brainers.
Whoever does it, once you get done, could you come back and tell us how many of those links went to the page that used to be there, and how many went somewhere else? That will give you a pretty good idea of how necessary that move was. Gene Nygaard 02:27, 19 September 2006 (UTC)
Sure, I'll work on some of those. I don't see it as an big deal though; they'll get sorted out. Like Gazjo said, the pages are in the right place now, and the links will be fine, in some time. I'll do a few a day, and chip away at it. As far as getting an idea of "how necessary the move was", that sounds a bit fatuous, doesn't it? I just picked out 10 links, eight of which wanted to point to the unit, one to the programming language, and one to the philosopher. I'd rather a Blaise Pascal link point to a disambiguation page than a page about pressure measurement. - GTBacchus( talk) 08:49, 19 September 2006 (UTC)
Most of the links that need fixing should actually have been to kPa, MPa, GPa, etc. and should have been fixed anyway. The list of pages that need fixing is getting smaller rapidly. Number of links is not a good measure of the dominant meaning of a term, especially for a unit of measure, which attracts a lot of links merely for technical reasons. The decision to move was certainly correct IMHO. Markus Kuhn 12:23, 19 September 2006 (UTC)
One hectopascal corresponds to about 1% of atmospheric pressure (near sea level)..."
Is this right? According to Pascal (unit), "the average atmospheric pressure, at sea level, is about 101.3 kilopascals", and since one hectopascal is 10 times less than a kilopascal, one hectopascal should be 0.1% of atmospheric pressure, shouldn't it? Palefire 07:58, 17 January 2007 (UTC)
In the article it says that 1 atm= 101 325. WTF is that? Is that 101 and 325? 101,325? What? WHO THE HELL WROTE THAT? —Preceding unsigned comment added by Paladin Hammer ( talk • contribs) 01:19, 22 October 2007 (UTC)
{{
convert}}
to give "101325 Pa (101.325 kPa)" we can have a non-breaking space and an explicit conversion to kPa, plus
{{convert|101325|Pa|kPa|abbr=on|comma=gaps}} may be a bit more daunting to edit! I'll try it.
NebY (
talk)
10:26, 22 March 2015 (UTC)It is my understanding that 101.364KPa is the same as 1 Atm,but the article states that it is 101.325Kpa,which is a big difference when doing a lengthy calculation and you need the unit as close to the decimal as possible. —Preceding unsigned comment added by 206.255.88.85 ( talk) 22:53, 20 March 2008 (UTC)
Redirect to the orders of magnitude page, OR , merge the magnitude page in please! I'm not much of an editor, so you get to decide. found it on google though :) (I marked out my own comment below)
I was doing a search for a term that I couldn't find even on google, GPa, and it redirected here, but using the browser's search tool to find it on the page yeilded only one result, the redirection notice.
Please fix this soon, someone, anyone? —Preceding
unsigned comment added by
24.22.176.33 (
talk)
01:58, 23 April 2008 (UTC)
how much is 15 PAmin in L.s Is it 15 L.s of 900 L.s —Preceding
unsigned comment added by
196.35.246.194 (
talk)
13:19, 8 June 2008 (UTC)
Not done Question Unclear
1atm = 1.01 x 105Pa = 13534[kgm-3] x 9.81[Nkg-1] x 0.76[m] where 13534kgm-3 is the density of liquid mercury, 9.81Nkg-1 is the gravity constant, 0.76m is the height of mercury in a mercury-in-bulb thermometer.
GPa is used not only by Tectonophysicists, but also (and I guess this use is much more substantial) in Mechanical Engineering, see [1], quote:
...Young's modulus is the ratio of stress, which has units of pressure, to strain, which is dimensionless; therefore Young's modulus itself has units of pressure.
The SI unit of modulus of elasticity (E, or less commonly Y) is the pascal (Pa or N/m²); the practical units are megapascals (MPa or N/mm²) or gigapascals (GPa or kN/mm²). —Preceding unsigned comment added by 77.126.173.47 ( talk) 16:45, 11 February 2010 (UTC)
Well, as there was no opposition, I added this myself (my first wikipedia edit :) ... —Preceding unsigned comment added by 89.138.141.137 ( talk) 19:29, 14 November 2010 (UTC)
In the top right box on this page, it says kg/m^2, which doesn't make much sense... I'm almost 100% sure it's newtons/m^2 —Preceding unsigned comment added by 98.185.253.215 ( talk) 17:53, 11 April 2010 (UTC)
Just some questions regarding pascals in different numbers of dimensions.
For instance, would a "2D pascal" be the same as a force of one newton being applied over one metre (not a joule, but a newton is "spread" over a metre, like a pascal is a newton "spread" over a square metre)? What about a "4D pascal"? Would it be the same as one newton acting over 1 cubic metre? Could somebody please clarify this for me? —Preceding unsigned comment added by 75.104.128.36 ( talk) 18:14, 19 April 2011 (UTC)
This comment was moved from elsewhere on this talk page by User:Martinvl
There is an inconsistent use of capitalization of letters according to the SI rules... That is that if the unit with the pronoun, such as kilo, is larger than the unit, Pascal for example, then the letter should be capitalized, therefore KPa rather than kPa and HPa rather than hPa. Sorry if this is in the wrong area but I did not know where else to comment. David Marshall B.Ed. ( talk) 08:35, 3 July 2011 (UTC)
Suggest we restore Sixty Symbols video as quite relevant. Moriarty is a full Professor of physics at UofN [2]; video illustrates pascales, etc quite nicely. – S. Rich ( talk) 20:37, 30 April 2013 (UTC)
1 Pa = 1 kg/(m·s2)-- Wyn.junior ( talk) 00:29, 6 April 2014 (UTC)
This sentence is completly wrong: "Standard atmospheric pressure is 100 kPa.[6] This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries."
All kind of calculations in the gas industry worldwide (exept in USA) are based on Standard atmohsphere (1013.25 hPa). The normilzed cubic meter of natural gas for example , as well as the formulas for the ideal and real gas physics are based on that same number. Borkers refers worldwide to quantities based on this standard pressure (as well as the standard temperature).
Pneumatics- at least in europe, is in the absolute pressure range also refered to the standard athmosphere. At least it is so in Europe.
The standard in aviation is still and will be kept at 1013.25 hPa. (By the way, the hecto is written in minor and not in capital letters- see ISO and System definitions for SI) -- Cosy-ch ( talk) 07:03, 22 May 2015 (UTC)
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This article states "one atmosphere is exactly equal to 1013.25 hPa.' This is the International Standard Atmosphere (ISA) which is used to calibrate instruments at certain temperatures and pressures. One Atmosphere is still 1000 hPa. -- Metricmike ( talk) 01:43, 9 April 2010 (UTC)
The article states "It is a measure of force per unit area i.e. equivalent to one newton per square meter or one joule per cubic meter.". A unit of force per unit area is not what's expressed as "one joule per cubic meter". A cubic meter is not an area. This should be cleared up. —Preceding unsigned comment added by 192.35.35.34 ( talk) 19:59, 2 April 2009 (UTC)
Neither a joule is a newton, pressure is a force per unit area but also an energy density and a J/m^3=N*m/m^3. It's actually correct and worth stressing more. Think for example at the perfect gas law PV=NkT, p=NkT/V, an energy density. 79.21.143.99 ( talk) 14:18, 16 April 2015 (UTC)
This artical say it is 1 kPa. The mars article says it is 0.1 kPa. One of these is wrong. My understanding is that it is 0.7-0.9 kPa which is just slightly above the point where water cannot exist in the liquid phase. Can those who made the wrong example make a correction? -- Terrell Larson
Blaise Pascal was an important mathematician, but Galileo Galilei was the first person to weigh the atmosphere. The unit of atmospheric pressure (perhaps) should be the Galileo, not the hectopascal. Pascal didn't do much in the area of weighing the atmosphere. Millibar is the best term, though. Trudy June 28th, 2005 11:03 Z
1 pascal (Pa) = 1 N/m2 = 1 J/m3 = 1 kg·m–1·s–2
Are you sure that it's " 1 kg·m–1·s–2 " without such thing as an area? that's only Mass/Acceleration...
Sorry to be such a novice/unwitting terrorist, but I made a change to the page and didn't include links or anything like that. I added that the Pa is equal to one Joule/m^3 since I think that's important. I also apologize for sticking this comment here, but I didn't think it warranted a new section.
I wanted to know what a "pascal" was? So I came to wikipedia to find out. I read the write up on "pascal" and still do not know what a pascal is?
In order to completely understand what a "pascal" is, it is necessary to explain why Mr. Pascal first decided to use that unit of measurement. What reference point did he first use and why?
What is one pascal equal to in the physical universe?
Or how did he arrive at what we know as one "pascal"?
I expect it to be something simple.
Something that an elementary student could understand.
For example 0 degrees celcius is where water freezes and 100 degrees is where water boils. (Or in degrees kelvin, 0 is where everything freezes and stops.)
When those reference points are known then, degrees celcius (and kelvin) means something.
If it meant that one pascal was equal to the atmospheric pressure at sea level, then it would mean something.
That is simple. It is a reference point. It is something a person can wrap his mind around. It is an anchor point. Otherwise it is ambiguous.
Would someone who knows this stuff please include it in the write up on "pascal"?
Diogeneseii ( talk) 21:41, 8 June 2014 (UTC) Diogeneseii
messurment: of compressed energy in meter cubic.
What???? Peter Horn 03:23, 1 September 2006 (UTC)
100 000 Pa devided by 101 325 Pa gives 750.062, not exactly 750 . Peter Horn 03:23, 1 September 2006 (UTC)
The result of the debate was PAGE MOVED per discussion below. - GTBacchus( talk) 20:38, 17 September 2006 (UTC)
Instead of directing here when searching for "Pascal", I think it should first go to the article on Pascal the person.
Sorry I missed the discussion of the proposed move; I think it was a damn foolish idea.
But since it was moved, who is going to now step in and fix the 500 links to a disambiguation page at Pascal (click on What links here? for that page), and ensure that they go to the right article, rather than linking to a disambiguation page?
Some things, such as redirects from
㎫, are no-brainers.
Whoever does it, once you get done, could you come back and tell us how many of those links went to the page that used to be there, and how many went somewhere else? That will give you a pretty good idea of how necessary that move was. Gene Nygaard 02:27, 19 September 2006 (UTC)
Sure, I'll work on some of those. I don't see it as an big deal though; they'll get sorted out. Like Gazjo said, the pages are in the right place now, and the links will be fine, in some time. I'll do a few a day, and chip away at it. As far as getting an idea of "how necessary the move was", that sounds a bit fatuous, doesn't it? I just picked out 10 links, eight of which wanted to point to the unit, one to the programming language, and one to the philosopher. I'd rather a Blaise Pascal link point to a disambiguation page than a page about pressure measurement. - GTBacchus( talk) 08:49, 19 September 2006 (UTC)
Most of the links that need fixing should actually have been to kPa, MPa, GPa, etc. and should have been fixed anyway. The list of pages that need fixing is getting smaller rapidly. Number of links is not a good measure of the dominant meaning of a term, especially for a unit of measure, which attracts a lot of links merely for technical reasons. The decision to move was certainly correct IMHO. Markus Kuhn 12:23, 19 September 2006 (UTC)
One hectopascal corresponds to about 1% of atmospheric pressure (near sea level)..."
Is this right? According to Pascal (unit), "the average atmospheric pressure, at sea level, is about 101.3 kilopascals", and since one hectopascal is 10 times less than a kilopascal, one hectopascal should be 0.1% of atmospheric pressure, shouldn't it? Palefire 07:58, 17 January 2007 (UTC)
In the article it says that 1 atm= 101 325. WTF is that? Is that 101 and 325? 101,325? What? WHO THE HELL WROTE THAT? —Preceding unsigned comment added by Paladin Hammer ( talk • contribs) 01:19, 22 October 2007 (UTC)
{{
convert}}
to give "101325 Pa (101.325 kPa)" we can have a non-breaking space and an explicit conversion to kPa, plus
{{convert|101325|Pa|kPa|abbr=on|comma=gaps}} may be a bit more daunting to edit! I'll try it.
NebY (
talk)
10:26, 22 March 2015 (UTC)It is my understanding that 101.364KPa is the same as 1 Atm,but the article states that it is 101.325Kpa,which is a big difference when doing a lengthy calculation and you need the unit as close to the decimal as possible. —Preceding unsigned comment added by 206.255.88.85 ( talk) 22:53, 20 March 2008 (UTC)
Redirect to the orders of magnitude page, OR , merge the magnitude page in please! I'm not much of an editor, so you get to decide. found it on google though :) (I marked out my own comment below)
I was doing a search for a term that I couldn't find even on google, GPa, and it redirected here, but using the browser's search tool to find it on the page yeilded only one result, the redirection notice.
Please fix this soon, someone, anyone? —Preceding
unsigned comment added by
24.22.176.33 (
talk)
01:58, 23 April 2008 (UTC)
how much is 15 PAmin in L.s Is it 15 L.s of 900 L.s —Preceding
unsigned comment added by
196.35.246.194 (
talk)
13:19, 8 June 2008 (UTC)
Not done Question Unclear
1atm = 1.01 x 105Pa = 13534[kgm-3] x 9.81[Nkg-1] x 0.76[m] where 13534kgm-3 is the density of liquid mercury, 9.81Nkg-1 is the gravity constant, 0.76m is the height of mercury in a mercury-in-bulb thermometer.
GPa is used not only by Tectonophysicists, but also (and I guess this use is much more substantial) in Mechanical Engineering, see [1], quote:
...Young's modulus is the ratio of stress, which has units of pressure, to strain, which is dimensionless; therefore Young's modulus itself has units of pressure.
The SI unit of modulus of elasticity (E, or less commonly Y) is the pascal (Pa or N/m²); the practical units are megapascals (MPa or N/mm²) or gigapascals (GPa or kN/mm²). —Preceding unsigned comment added by 77.126.173.47 ( talk) 16:45, 11 February 2010 (UTC)
Well, as there was no opposition, I added this myself (my first wikipedia edit :) ... —Preceding unsigned comment added by 89.138.141.137 ( talk) 19:29, 14 November 2010 (UTC)
In the top right box on this page, it says kg/m^2, which doesn't make much sense... I'm almost 100% sure it's newtons/m^2 —Preceding unsigned comment added by 98.185.253.215 ( talk) 17:53, 11 April 2010 (UTC)
Just some questions regarding pascals in different numbers of dimensions.
For instance, would a "2D pascal" be the same as a force of one newton being applied over one metre (not a joule, but a newton is "spread" over a metre, like a pascal is a newton "spread" over a square metre)? What about a "4D pascal"? Would it be the same as one newton acting over 1 cubic metre? Could somebody please clarify this for me? —Preceding unsigned comment added by 75.104.128.36 ( talk) 18:14, 19 April 2011 (UTC)
This comment was moved from elsewhere on this talk page by User:Martinvl
There is an inconsistent use of capitalization of letters according to the SI rules... That is that if the unit with the pronoun, such as kilo, is larger than the unit, Pascal for example, then the letter should be capitalized, therefore KPa rather than kPa and HPa rather than hPa. Sorry if this is in the wrong area but I did not know where else to comment. David Marshall B.Ed. ( talk) 08:35, 3 July 2011 (UTC)
Suggest we restore Sixty Symbols video as quite relevant. Moriarty is a full Professor of physics at UofN [2]; video illustrates pascales, etc quite nicely. – S. Rich ( talk) 20:37, 30 April 2013 (UTC)
1 Pa = 1 kg/(m·s2)-- Wyn.junior ( talk) 00:29, 6 April 2014 (UTC)
This sentence is completly wrong: "Standard atmospheric pressure is 100 kPa.[6] This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries."
All kind of calculations in the gas industry worldwide (exept in USA) are based on Standard atmohsphere (1013.25 hPa). The normilzed cubic meter of natural gas for example , as well as the formulas for the ideal and real gas physics are based on that same number. Borkers refers worldwide to quantities based on this standard pressure (as well as the standard temperature).
Pneumatics- at least in europe, is in the absolute pressure range also refered to the standard athmosphere. At least it is so in Europe.
The standard in aviation is still and will be kept at 1013.25 hPa. (By the way, the hecto is written in minor and not in capital letters- see ISO and System definitions for SI) -- Cosy-ch ( talk) 07:03, 22 May 2015 (UTC)
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