<Dl> <Dd> where V is the volume of gas at temperature T, V is the volume at 0 ° C . </Dd> </Dl> <Dd> where V is the volume of gas at temperature T, V is the volume at 0 ° C . </Dd> <P> The kinetic theory of gases relates the macroscopic properties of gases, such as pressure and volume, to the microscopic properties of the molecules which make up the gas, particularly the mass and speed of the molecules . In order to derive Charles' law from kinetic theory, it is necessary to have a microscopic definition of temperature: this can be conveniently taken as the temperature being proportional to the average kinetic energy of the gas molecules, E: </P> <Dl> <Dd> T ∝ E k _̄ . (\ displaystyle T \ propto (\ bar (E_ (\ rm (k)))). \,) </Dd> </Dl>

Why we use the same charles law apparatus at all four different temperature