Page "Molar volume" Paragraph 8
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Hence, for a given temperature and pressure, the molar volume is the same for all ideal gases and is known to the same precision as the gas constant: R = 8. 314 4621 ( 75 ) J mol < sup >− 1 </ sup > K < sup >− 1 </ sup >, that is a relative standard uncertainty of 9. 1 × 10 < sup >− 7 </ sup >, according to the 2010 CODATA recommended value.
The molar volume of an ideal gas at 100 kPa ( 1 bar ) is
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2.476 seconds.