Difference between revisions of "Density"
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| − | The '''density''' (symbol: '''''ρ''''') or, more strictly, '''mass density''', of a homogeneous system (or material) is the [[mass]] per unit [[volume]]. It is usually measured in grams per cubic centimetre ({{nowrap|g cm<sup>−3</sup>}}) for condensed phases (solids and liquids) and in kilograms per cubic metre ({{nowrap|kg m<sup>−3</sup>}}) for gases: {{nowrap|1=1 kg m<sup>−3</sup> =}} {{nowrap|1000 g cm<sup>−3</sup>}}. Densities of solids and liquids usually range from {{nowrap|0.62 g cm<sup>−3</sup>}} ([[isopentane]]) to {{nowrap|22.6 g cm<sup>−3</sup>}} ([[osmium]]); densities of gases at normal temperatures and pressures range from {{nowrap|0.085 kg m<sup>−3</sup>}} ([[hydrogen]]) to {{nowrap|13 kg m<sup>−3</sup>}} ([[tungsten hexafluoride]]). Density, unlike mass or volume, is an [[intensive property]] of a system. | + | The '''density''' (symbol: '''''ρ''''') or, more strictly, '''mass density''', of a homogeneous system (or material) is the [[mass]] per unit [[volume]].<ref>{{GreenBook2nd|page=12}}.</ref><ref>{{GoldBook|name=density, ''ρ''|id=D01590|accessdate=2011-04-04}}.</ref> It is usually measured in grams per cubic centimetre ({{nowrap|g cm<sup>−3</sup>}}) for condensed phases (solids and liquids) and in kilograms per cubic metre ({{nowrap|kg m<sup>−3</sup>}}) for gases: {{nowrap|1=1 kg m<sup>−3</sup> =}} {{nowrap|1000 g cm<sup>−3</sup>}}. Densities of solids and liquids usually range from {{nowrap|0.62 g cm<sup>−3</sup>}} ([[isopentane]]) to {{nowrap|22.6 g cm<sup>−3</sup>}} ([[osmium]]); densities of gases at normal temperatures and pressures range from {{nowrap|0.085 kg m<sup>−3</sup>}} ([[hydrogen]]) to {{nowrap|13 kg m<sup>−3</sup>}} ([[tungsten hexafluoride]]). Density, unlike mass or volume, is an [[intensive property]] of a system. |
==Notes and references== | ==Notes and references== | ||
Latest revision as of 05:39, 4 April 2011
The density (symbol: ρ) or, more strictly, mass density, of a homogeneous system (or material) is the mass per unit volume.[1][2] It is usually measured in grams per cubic centimetre (g cm−3) for condensed phases (solids and liquids) and in kilograms per cubic metre (kg m−3) for gases: 1 kg m−3 = 1000 g cm−3. Densities of solids and liquids usually range from 0.62 g cm−3 (isopentane) to 22.6 g cm−3 (osmium); densities of gases at normal temperatures and pressures range from 0.085 kg m−3 (hydrogen) to 13 kg m−3 (tungsten hexafluoride). Density, unlike mass or volume, is an intensive property of a system.
Notes and references
Notes
References
- ↑ Quantities, Units and Symbols in Physical Chemistry, 2nd ed.; Blackwell Science: Oxford, 1993; p 12. ISBN 0-63203-5838, <http://old.iupac.org/publications/books/gbook/green_book_2ed.pdf>.
- ↑ density, ρ, <http://goldbook.iupac.org/D01590.html> (accessed 4 April 2011), Compendium of Chemical Terminology Internet edition; International Union of Pure and Applied Chemistry (IUPAC).
External links
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See also the corresponding article on Wikipedia. |
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