Ideal gas law also known as the general gas law is an equation of the state of a hypothetical ideal gas that was discovered by Benoit Paul Émilé Clapeyron a physicist and engineer. For a gas to be 'ideal', the gas particles should have negligible volume, do not have intermolecular forces, and the gas particles move randomly. PV=nRT when R=0.0821 L•atm/mol•k