where:

*V*is the volume of the gas.*n*is the amount of substance of the gas.*k*is a proportionality constant.

The most important consequence of Avogadro's law is that the ideal gas constant has the same value for all gases. This means that the constant

where:

*p*is the pressure of the gas*T*is the temperature of the gas

has the same value for all gases, independent of the size or mass of the gas molecules.

One mole of an ideal gas occupies **22.4** liters
(dm³) at
STP, and occupies 24.45 litres at SATP (Standard Ambient
Temperature and Pressure = 273K and 1 atm or 101.325 kPa).
This volume is often referred to as the
molar volume of an ideal gas. Real gases may deviate
from this value.