Ideal gas law The ideal gas law is an equations of state for a gas, where the state of the gas is its condition at a given timelexpressed by PV=nRT, where P=pressure, V=volume, n=moles of the gas, R=the universal gas constant, and T=absolute temperature. This equations expresses behavior approached by real gases at high T and low P. The Ideal Gas Law, PV = nRT, is widely used to compute the pressure, volume, or temperature of a gas at the given conditions. 
