What is the molar volume of an ideal gas?
At 273.15 K and 100 kPa, the molar volume of an ideal gas is V_m = 22.71095464e-3 m^3/mol = 22.71095464 L/mol (exact, SI definition).
Open the interactive PhysRef tool →Key facts
| Value | 22.71095464 L/mol |
|---|---|
| In m^3 | 22.71095464e-3 m^3/mol |
| Conditions | 273.15 K, 100 kPa (IUPAC STP) |
| Exactness | Exact by SI definition (uncertainty 0) |
| Source | CODATA 2018 |
Frequently asked questions
What is the molar volume of an ideal gas?
V_m = 22.71095464 L/mol at IUPAC STP (273.15 K, 100 kPa).
Is it 22.4 L/mol?
22.414 L/mol applies at the legacy STP of 273.15 K and 1 atm; the modern IUPAC STP (100 kPa) gives 22.711 L/mol.
How is molar volume calculated?
From the ideal gas law, V_m = R·T/P, using the gas constant R.
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