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"Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser." Which compounds are denser than Os or Ir? Or are we talking about non standard conditions? — Preceding unsigned comment added by 200.232.235.231 ( talk) 05:24, 14 June 2019 (UTC)
Methylene Iodide is unique in that it is a dense (3.325 g·cm−3) room temperature liquid and also an organic compound. It is useful in chemistry laboratories as a methylenating agent and for rare metal / diamond testing & refining liquid.
There is also Clerici solution (thallium formate plus thallium malonate in water). It is liquid at room temperature, with a density of 4.25 g/cm3, however this increases to 5 when warmed. It, along with methylene iodide, are useful for prospecting as they tend to cause precious metals to sink away from ore particles. With Clerici solution, the opposite occurs and diamonds float on it's surface. Another key to their usefulness in this application is that they do not form alloys or react with the items being refined, as gallium might.
Gallium's solid density is 5.91 g·cm−3 but it's melting point is just 29.76 Celsius. (Where it's density becomes 6.095 g·cm−3).
Various gallium alloys exist that are liquid at room temperature and below, e.g. Galinstan. Melting point, -19 Celsius. Density, 6.44 g/cm3 at STP. This has possible applications as a coolant and it, with gallium it's self, are of interest to electronics and semiconductor manufacturers.
Bromine is another example, at 3.1028 g·cm−3 and boiling at 58.8 °C 137.84 fahrenheit 331.9 kelvin
I believe these would make interesting additions to the table as they all have useful properties based on them being dense liquids at, or near, room temperature. A check of google for 'densest liquid' quickly highlights the number of people asking the same thing; with the sole response commonly being 'mercury'. Those examples sweep a good selection of different forms (e.g. none metallic element, metal, metal alloy, organic compound, solution).
"...but not the densest materials." What are the densest materials ? What is denser than osmium ? — Preceding unsigned comment added by 165.222.184.132 ( talk) 12:14, 13 October 2011 (UTC)
Not sure where to ask this, so I'll just put it here. On the table for #Densities_of_various_materials, could this be cleaned up, so it can be properly sorted by density? i.e. Removing intangible things or putting them in a separate table. Such as the Sun, core of the Earth, black hole, etc.. Thanks. 209.150.195.106 ( talk) 22:59, 10 November 2011 (UTC)
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Oddly, while properly coded, the symbol for rho is improper in the definition following the equation (in which rho shows properly (Firefox/Mac OS X). —Preceding unsigned comment added by Alanbrowne ( talk • contribs) 15:59, 17 May 2010 (UTC)
may be, Gravity is a special case of Density the electron does not spin fast enough to merge with the nuclei of the atom, i.e. lower mass/vacuum energy momentum torque of electron to that of the nuclei of the atom, may be because of the electron's smaller mass radius in comparison to the atom's larger radius. when moving to a higher vacuum energy density (may be because larger mass of the nuclei accumulate larger vacuum energy vector near or on it's surface with it's own torque momentum with vacuum energy)near the nuclei of the atom: electron loses photon because it must spin faster (higher torque momentum of the electron's matter surface resistance vector and the vacuum energy vector which leads to a higher spin of the electron),noting: lower energy vacuum space energy with higher energy matter of the electron and/or the nuclei of the atom. density= matter/vacuum energy-- 99.109.130.141 ( talk) 03:54, 7 October 2010 (UTC)--e:Y,?:G 03:55, 7 October 2010 (UTC) I have initiated this discussion about Density because I have not read an article (or I could not find one) where the topic is: Density of matter in vacuum or Density of matter with respect to vacuum energy, which is very important to physics.--e:Y,?:G 04:15, 7 October 2010 (UTC) —Preceding unsigned comment added by E:Y,?:G ( talk • contribs) in other words, could it be that: if and where matter is inside vacuum i.e. vacuum energy and at vacuum large enough in volume, density = matter/vacuum energy is higher,denser energy medium i.e. matter/lower,lesser energy medium i.e. vacuum energy
then
the lower, lesser energy medium i.e. vacuum energy would want to "dilute" the higher, denser energy medium i.e. matter; therefore, the inward force exerted by lower, lesser energy medium i.e. vacuum energy onto the higher, denser matter.--e:Y,?:G 04:47, 7 October 2010 (UTC) —Preceding unsigned comment added by E:Y,?:G ( talk • contribs)
I it may be a stupid question but isn't the density of a black hole infinite? I mean isn't that kind of how a black hole is defined, as a point in space with no extent, a specific mass and infinite density. and that is why light can't escape.
If it doesn't have infinite density, then some amount of radiation can escape and then it's not a black body.
Rphb (
talk) 21:17, 23 June 2012 (UTC)
Should we also include the most massive currently known SMBH - S5 0014+81 in this list? Would be informative, according to me. More so in view of the discussion above, concerning the mass-density relation. Since its mass is estimated at 4×1010M☉, while another study suggests a 10 times lower estimate (due to an effect of amplification of the jets' brightness), we could pick any of the runner-ups instead: List of most massive black holes.-- Bobbylon ( talk) 00:19, 10 November 2016 (UTC)
Measurements of densities of solutions/mixtures can be used to determine activity coefficients. This statement has been labeled as unsourced.-- 193.231.20.25 ( talk) 10:11, 14 January 2014 (UTC)
There is no real need to be sourced.-- 193.231.20.25 ( talk) 13:30, 15 May 2014 (UTC)
What is the relationship between Denstiy and Scratch resistance? — Preceding unsigned comment added by 193.194.132.70 ( talk) 12:04, 1 August 2014 (UTC)
Scratch resistance has more to do with hardness and elasticity than with density. There is probably some correlation between low density and low hardness, but high density is no guarantee of hardness or scratch resistance. For instance, Gold is very dense, but scratches easily because it is soft and inelastic. Tungsten Carbide is dense, but also very hard and is highly resistant to scratching. Rubber is not hard, but very elastic, and because nearly all of the deformation is non-permanent, it is hard to scratch. Dudecon ( talk) 04:31, 2 August 2014 (UTC)
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Correct the units in the table "Densities of various materials covering a range of values". It is support g/cm^3, not kg/m^3. Maxralf ( talk) 16:59, 4 January 2015 (UTC)
Not done as the existing units are correct - e.g. water weighs 1,000kg (1 Tonne) per cubic metre, it does not weigh 1,000g (1 kg) per CC. - Arjayay ( talk) 17:19, 4 January 2015 (UTC)
The subsection for U.S. Customary Units under the Common Units heading makes conflicting statements. It includes both lb/ft^3 and slugs/ft^3 as possible density units. This is physically incorrect, as noted in another section, as lb/ft^3 is a term for unit weight. Slugs/ft^3 is the only correct term in the set.
If the common usage of lb/ft^3 in place of density is to be noted, that should be NOTED in the units section so that a person does not conclude that weight/volume is the proper way to calculate density, as we know that mass/volume is the definition of density.
Please make this edit. Thank you. — Preceding unsigned comment added by 129.252.33.12 ( talk) 21:42, 25 January 2015 (UTC)
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The table of approximate material densities needs to be corrected. The density units in the header are in kg/m^3 so that air is shown correctly at 1.2kg/m^3. What is then incorrect is to show water as 1kg/m^3 and I suspect a lot more of the solid materials in the table also need to be increased by 1000. These figures have probably been taken from another table with units of g/cm^3. For instance Gold is shown as 7.? whereas I'd expect a cubic metre of gold to be many tonnes - probably 7000 kg or so and water, not 1.0 but 1000 as it shows in an earlier table. 86.190.18.53 ( talk) 17:58, 10 February 2015 (UTC)
Not done I cannot see a "Table of approximate material densities" but assuming you mean the "Various materials" table, Water does not say 1kg/m³, it says 1,000kg/m³ that is a comma not a stop. As for the Gold figure, I can only see 19,320 not 7.? - Arjayay ( talk) 18:14, 10 February 2015 (UTC)
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Please fix sorting of table "Others" so that Interstellar medium (kg/m3 = 10-19) is correctly sorted as smaller than the other elements of the list Wheatbyproducts ( talk) 04:31, 11 November 2015 (UTC)
When we say that density is a positive scalar quantity. What do we actually mean by positive here ? -- Ankit2299 ( talk) 06:58, 31 December 2015 (UTC)
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195.171.207.74 ( talk) 13:06, 1 December 2016 (UTC)
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I'd like to update the value for density of seawater. There is a standard value at 25C and 35 g/kg salinity. The current value is way off. I'd like to update it to 1023.6 kg/m3, referring to the website: http://web.mit.edu/seawater/ and the papers: a. K.G. Nayar, M.H. Sharqawy, L.D. Banchik, and J.H. Lienhard V, "Thermophysical properties of seawater: A review and new correlations that include pressure dependence," Desalination, Vol. 390, pp.1-24, 2016. doi:10.1016/j.desal.2016.02.024 (preprint) b. Mostafa H. Sharqawy, John H. Lienhard V, and Syed M. Zubair, "Thermophysical properties of seawater: A review of existing correlations and data," Desalination and Water Treatment, Vol. 16, pp.354-380, April 2010. (PDF file which includes corrections through January 2016.) Betterworld123 ( talk) 22:47, 24 February 2017 (UTC)
Value given in table for concrete is 2,000 kg/m3, but all other sources I have read, including Wikipedia page "Properties of Concrete", give a typical value of 2,400. Please can someone review and edit as necessary. — Preceding unsigned comment added by 42.98.92.235 ( talk) 06:32, 9 May 2017 (UTC)
Planck density: density of hypothetical Planck Star or central object of black hole present there instead of singularity. [1] 2601:580:109:FFAD:DD87:4ADD:F44:264E ( talk) 01:08, 12 February 2019 (UTC)
What is the significance of density and sp gr. test in oil industry field? 185.240.17.40 ( talk) 07:27, 29 March 2022 (UTC)
Do we only include stable elements? Hassium is unstable with isotope-276 having the longest half-life of 1.1 hour. [4] Plutonium is unstable with isotope-244 having the longest half-life of 80.8 million years. Do we include plutonium? 2600:1700:D0A0:21B0:16C:429D:E228:58EB ( talk) 01:02, 16 May 2022 (UTC)
Who got rid of the page (Orders of magnitude (density) )? 74.135.194.87 ( talk) 18:25, 17 February 2024 (UTC)
This is the
talk page for discussing improvements to the
Density article. This is not a forum for general discussion of the article's subject. |
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Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
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"Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser." Which compounds are denser than Os or Ir? Or are we talking about non standard conditions? — Preceding unsigned comment added by 200.232.235.231 ( talk) 05:24, 14 June 2019 (UTC)
Methylene Iodide is unique in that it is a dense (3.325 g·cm−3) room temperature liquid and also an organic compound. It is useful in chemistry laboratories as a methylenating agent and for rare metal / diamond testing & refining liquid.
There is also Clerici solution (thallium formate plus thallium malonate in water). It is liquid at room temperature, with a density of 4.25 g/cm3, however this increases to 5 when warmed. It, along with methylene iodide, are useful for prospecting as they tend to cause precious metals to sink away from ore particles. With Clerici solution, the opposite occurs and diamonds float on it's surface. Another key to their usefulness in this application is that they do not form alloys or react with the items being refined, as gallium might.
Gallium's solid density is 5.91 g·cm−3 but it's melting point is just 29.76 Celsius. (Where it's density becomes 6.095 g·cm−3).
Various gallium alloys exist that are liquid at room temperature and below, e.g. Galinstan. Melting point, -19 Celsius. Density, 6.44 g/cm3 at STP. This has possible applications as a coolant and it, with gallium it's self, are of interest to electronics and semiconductor manufacturers.
Bromine is another example, at 3.1028 g·cm−3 and boiling at 58.8 °C 137.84 fahrenheit 331.9 kelvin
I believe these would make interesting additions to the table as they all have useful properties based on them being dense liquids at, or near, room temperature. A check of google for 'densest liquid' quickly highlights the number of people asking the same thing; with the sole response commonly being 'mercury'. Those examples sweep a good selection of different forms (e.g. none metallic element, metal, metal alloy, organic compound, solution).
"...but not the densest materials." What are the densest materials ? What is denser than osmium ? — Preceding unsigned comment added by 165.222.184.132 ( talk) 12:14, 13 October 2011 (UTC)
Not sure where to ask this, so I'll just put it here. On the table for #Densities_of_various_materials, could this be cleaned up, so it can be properly sorted by density? i.e. Removing intangible things or putting them in a separate table. Such as the Sun, core of the Earth, black hole, etc.. Thanks. 209.150.195.106 ( talk) 22:59, 10 November 2011 (UTC)
This
level-4 vital article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
WikiProject Physics' Reviewing Cheatsheet (11:16, 8 July 2008 (UTC))
Do not remove the elements, but rather strike them as they becomes useless or irrelevant (i.e write
<s>text to be struck</s>) to indicate that this element was verified and found to be alright.
If everything in one of the section (i.e everything in one hidden-box has been addressed), strike that particular hidden box's title.
This cheetsheet can be used by anyone.
To add the Reviewing Cheatsheet to an article's talk page, simply place {{subst:Wikipedia:WikiProject Physics/Projects of the Week/Reviewing Cheatsheet}} immediately before the first section.
Oddly, while properly coded, the symbol for rho is improper in the definition following the equation (in which rho shows properly (Firefox/Mac OS X). —Preceding unsigned comment added by Alanbrowne ( talk • contribs) 15:59, 17 May 2010 (UTC)
may be, Gravity is a special case of Density the electron does not spin fast enough to merge with the nuclei of the atom, i.e. lower mass/vacuum energy momentum torque of electron to that of the nuclei of the atom, may be because of the electron's smaller mass radius in comparison to the atom's larger radius. when moving to a higher vacuum energy density (may be because larger mass of the nuclei accumulate larger vacuum energy vector near or on it's surface with it's own torque momentum with vacuum energy)near the nuclei of the atom: electron loses photon because it must spin faster (higher torque momentum of the electron's matter surface resistance vector and the vacuum energy vector which leads to a higher spin of the electron),noting: lower energy vacuum space energy with higher energy matter of the electron and/or the nuclei of the atom. density= matter/vacuum energy-- 99.109.130.141 ( talk) 03:54, 7 October 2010 (UTC)--e:Y,?:G 03:55, 7 October 2010 (UTC) I have initiated this discussion about Density because I have not read an article (or I could not find one) where the topic is: Density of matter in vacuum or Density of matter with respect to vacuum energy, which is very important to physics.--e:Y,?:G 04:15, 7 October 2010 (UTC) —Preceding unsigned comment added by E:Y,?:G ( talk • contribs) in other words, could it be that: if and where matter is inside vacuum i.e. vacuum energy and at vacuum large enough in volume, density = matter/vacuum energy is higher,denser energy medium i.e. matter/lower,lesser energy medium i.e. vacuum energy
then
the lower, lesser energy medium i.e. vacuum energy would want to "dilute" the higher, denser energy medium i.e. matter; therefore, the inward force exerted by lower, lesser energy medium i.e. vacuum energy onto the higher, denser matter.--e:Y,?:G 04:47, 7 October 2010 (UTC) —Preceding unsigned comment added by E:Y,?:G ( talk • contribs)
I it may be a stupid question but isn't the density of a black hole infinite? I mean isn't that kind of how a black hole is defined, as a point in space with no extent, a specific mass and infinite density. and that is why light can't escape.
If it doesn't have infinite density, then some amount of radiation can escape and then it's not a black body.
Rphb (
talk) 21:17, 23 June 2012 (UTC)
Should we also include the most massive currently known SMBH - S5 0014+81 in this list? Would be informative, according to me. More so in view of the discussion above, concerning the mass-density relation. Since its mass is estimated at 4×1010M☉, while another study suggests a 10 times lower estimate (due to an effect of amplification of the jets' brightness), we could pick any of the runner-ups instead: List of most massive black holes.-- Bobbylon ( talk) 00:19, 10 November 2016 (UTC)
Measurements of densities of solutions/mixtures can be used to determine activity coefficients. This statement has been labeled as unsourced.-- 193.231.20.25 ( talk) 10:11, 14 January 2014 (UTC)
There is no real need to be sourced.-- 193.231.20.25 ( talk) 13:30, 15 May 2014 (UTC)
What is the relationship between Denstiy and Scratch resistance? — Preceding unsigned comment added by 193.194.132.70 ( talk) 12:04, 1 August 2014 (UTC)
Scratch resistance has more to do with hardness and elasticity than with density. There is probably some correlation between low density and low hardness, but high density is no guarantee of hardness or scratch resistance. For instance, Gold is very dense, but scratches easily because it is soft and inelastic. Tungsten Carbide is dense, but also very hard and is highly resistant to scratching. Rubber is not hard, but very elastic, and because nearly all of the deformation is non-permanent, it is hard to scratch. Dudecon ( talk) 04:31, 2 August 2014 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Correct the units in the table "Densities of various materials covering a range of values". It is support g/cm^3, not kg/m^3. Maxralf ( talk) 16:59, 4 January 2015 (UTC)
Not done as the existing units are correct - e.g. water weighs 1,000kg (1 Tonne) per cubic metre, it does not weigh 1,000g (1 kg) per CC. - Arjayay ( talk) 17:19, 4 January 2015 (UTC)
The subsection for U.S. Customary Units under the Common Units heading makes conflicting statements. It includes both lb/ft^3 and slugs/ft^3 as possible density units. This is physically incorrect, as noted in another section, as lb/ft^3 is a term for unit weight. Slugs/ft^3 is the only correct term in the set.
If the common usage of lb/ft^3 in place of density is to be noted, that should be NOTED in the units section so that a person does not conclude that weight/volume is the proper way to calculate density, as we know that mass/volume is the definition of density.
Please make this edit. Thank you. — Preceding unsigned comment added by 129.252.33.12 ( talk) 21:42, 25 January 2015 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
The table of approximate material densities needs to be corrected. The density units in the header are in kg/m^3 so that air is shown correctly at 1.2kg/m^3. What is then incorrect is to show water as 1kg/m^3 and I suspect a lot more of the solid materials in the table also need to be increased by 1000. These figures have probably been taken from another table with units of g/cm^3. For instance Gold is shown as 7.? whereas I'd expect a cubic metre of gold to be many tonnes - probably 7000 kg or so and water, not 1.0 but 1000 as it shows in an earlier table. 86.190.18.53 ( talk) 17:58, 10 February 2015 (UTC)
Not done I cannot see a "Table of approximate material densities" but assuming you mean the "Various materials" table, Water does not say 1kg/m³, it says 1,000kg/m³ that is a comma not a stop. As for the Gold figure, I can only see 19,320 not 7.? - Arjayay ( talk) 18:14, 10 February 2015 (UTC)
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206.80.31.55 ( talk) 19:41, 23 September 2015 (UTC)
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Please fix sorting of table "Others" so that Interstellar medium (kg/m3 = 10-19) is correctly sorted as smaller than the other elements of the list Wheatbyproducts ( talk) 04:31, 11 November 2015 (UTC)
When we say that density is a positive scalar quantity. What do we actually mean by positive here ? -- Ankit2299 ( talk) 06:58, 31 December 2015 (UTC)
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
195.171.207.74 ( talk) 13:06, 1 December 2016 (UTC)
jkfjjfrkmfrekj,fngkfdmvfkdhkfkfkkfkfkkf §§§§§§§§§§§§
This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
I'd like to update the value for density of seawater. There is a standard value at 25C and 35 g/kg salinity. The current value is way off. I'd like to update it to 1023.6 kg/m3, referring to the website: http://web.mit.edu/seawater/ and the papers: a. K.G. Nayar, M.H. Sharqawy, L.D. Banchik, and J.H. Lienhard V, "Thermophysical properties of seawater: A review and new correlations that include pressure dependence," Desalination, Vol. 390, pp.1-24, 2016. doi:10.1016/j.desal.2016.02.024 (preprint) b. Mostafa H. Sharqawy, John H. Lienhard V, and Syed M. Zubair, "Thermophysical properties of seawater: A review of existing correlations and data," Desalination and Water Treatment, Vol. 16, pp.354-380, April 2010. (PDF file which includes corrections through January 2016.) Betterworld123 ( talk) 22:47, 24 February 2017 (UTC)
Value given in table for concrete is 2,000 kg/m3, but all other sources I have read, including Wikipedia page "Properties of Concrete", give a typical value of 2,400. Please can someone review and edit as necessary. — Preceding unsigned comment added by 42.98.92.235 ( talk) 06:32, 9 May 2017 (UTC)
Planck density: density of hypothetical Planck Star or central object of black hole present there instead of singularity. [1] 2601:580:109:FFAD:DD87:4ADD:F44:264E ( talk) 01:08, 12 February 2019 (UTC)
What is the significance of density and sp gr. test in oil industry field? 185.240.17.40 ( talk) 07:27, 29 March 2022 (UTC)
Do we only include stable elements? Hassium is unstable with isotope-276 having the longest half-life of 1.1 hour. [4] Plutonium is unstable with isotope-244 having the longest half-life of 80.8 million years. Do we include plutonium? 2600:1700:D0A0:21B0:16C:429D:E228:58EB ( talk) 01:02, 16 May 2022 (UTC)
Who got rid of the page (Orders of magnitude (density) )? 74.135.194.87 ( talk) 18:25, 17 February 2024 (UTC)