Molar volume converter
Convert the volume of one mole of a gas, liquid or solid between SI, lab and US engineering units.
That's about the same as an ideal gas at 0 °C.
What it means
How much space is a mole?
Ideal gas values: 22.414 L/mol at 0 °C and 1 atm, 22.711 at 0 °C and 100 kPa (IUPAC STP), 24.465 at 25 °C and 1 atm.
Every unit
That molar volume in every unit
Learn
Three things worth knowing
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22.4 and 24.5
Ideal gas: 22.4 L/mol at 0 °C, 24.5 L/mol at 25 °C (both 1 atm).
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Avogadro and Loschmidt
Avogadro reasoned in 1811 that equal gas volumes hold equal numbers of molecules; Loschmidt estimated how many in 1865.
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STP changed
IUPAC moved standard pressure to 100 kPa in 1982, so STP molar volume is 22.71, not 22.41 L/mol.
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Background
About molar volume
The molar volume is the space one mole takes up. For an ideal gas it depends only on temperature and pressure: 22.4 L at 0 °C and 1 atm, 24.5 L at room temperature.
Liquids and solids are a thousand times denser: a mole of water fills 18 mL.