Editing Molar volume (section)

== Ideal gases ==
For [[ideal gas]]es, the molar volume is given by the [[ideal gas equation]]; this is a good approximation for many common gases at [[standard temperature and pressure]].
The ideal gas equation can be rearranged to give an expression for the molar volume of an ideal gas:
<math display="block">V_{\rm m} = \frac{V}{n} = \frac{RT}{P}</math>
Hence, for a given temperature and pressure, the molar volume is the same for all ideal gases and is based on the [[gas constant]]: ''R''&nbsp;= {{val|8.31446261815324|u=m<sup>3</sup>⋅Pa⋅K<sup>−1</sup>⋅mol<sup>−1</sup>}}, or about {{val|8.20573660809596e-5|u=m<sup>3</sup>⋅atm⋅K<sup>−1</sup>⋅mol<sup>−1</sup>}}.

The molar volume of an ideal gas at 100&nbsp;[[Pascal (unit)|kPa]] (1&nbsp;[[bar (unit)|bar]]) is
: {{val|0.022710954641485|end=...|u=m3/mol}} at 0&nbsp;°C,
: {{val|0.024789570296023|end=...|u=m3/mol}} at 25&nbsp;°C.
The molar volume of an ideal gas at 1 atmosphere of pressure is
: {{val|0.022413969545014|end=...|u=m3/mol}} at 0&nbsp;°C,
: {{val|0.024465403697038|end=...|u=m3/mol}} at 25&nbsp;°C.