Question

What is the relationship between the kinetic energy of molecules and their physical state?

Answer 1

kinetic theory of gases:

1. From kinetic theory of gases, the pressure $P$, volume $V$ and the kinetic energy $KE$ of a gas can be related by the following expression $PV=\frac{2}{3}KE$.
2. Similarly, the temperature $T$ is related to the kinetic energy as $KE=\frac{3}{2}kT$, where, $k$ is the Boltzmann's constant.
3. The state of a gas can be stated by its pressure, volume and temperature.

Hence, from the relations above it can be seen that the state of molecules is directly related to their kinetic energy.