Deduce Charles's law based on kinetic theory.

Explanation

Charles's law:
From the equation `P=(2)/(3)(U)/(V)=(2)/(3)u`, we get `PV=(2)/(3)U`
For a fixed pressure, the volume of the gas is proportional to internal energy of the gas or average kinetic energy of the gas and the average kinetic energy is directly proportional to absolute temperature. It implies that
`ValphaTor=(V)/(T)` constant
This is Charles's law.