# Molar volume of gas

V_m = (R*T)/P
Calculator of molar volume of gas.
Enter 'x' in the field to be calculated.
ideal gas constant in J/(mol.K)

This tool calculates the molar volume of a gas according to the following formula,

V_m = (R*T)/P

Vm: molar volume of gas in cubic meter per mol (m3/mol)
P: gas pressure in pascal (Pa)
T: gas temperature in Kelvin
R: Ideal Gas Constant, R \approx 8.314463\ J*mol^{-1}*K^{-1}

This formula assumes that the Ideal Gas Law applies i.e. the gas in under low to moderate pressure and temperature (pressure than 10 atm).

## Definition of molar volume

The molar volume of a gas is the volume occupied by a mole of that gas.
The usual unit is liter/mol (m3/mol in the international system).

## Examples of use

Under NTP (normal temperature and pressure), i.e. T = 0°C and P = 1 atm, one mole of gas always occupies 22.4 liters. Volume of a mole under NTP conditions = 22.4 liters.

Under STP conditions (Standard Temperature and Pressure), i.e. T = 25°C and P = 100 kPa, one mole of gas always occupies 24.8 liters. Volume of a mole under CATP conditions = 24.8 liters.