Molar volume

In chemistry and related fields, the molar volume, symbol V_m, or ${\displaystyle {\tilde {V}}}$ of a substance is the ratio of the volume occupied by a substance to the amount of substance, usually given at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (ρ):

Molar volume
Common symbols	Vm, ${\displaystyle {\tilde {V}}}$
SI unit	m3/mol
Other units	dm3/mol, cm3/mol
Dimension	L3 N−1

The molar volume has the SI unit of cubic metres per mole (m³/mol), although it is more typical to use the units cubic decimetres per mole (dm³/mol) for gases, and cubic centimetres per mole (cm³/mol) for liquids and solids.