# Kinetic Molecular theory of gases

Postulates or assumptions of kinetic theory of gases

1)Every gas is made up of a large number of extremely small particles called molecules. All the molecules of a particular gas are identical in mass and size and differ in these from gas to gas.

2)The molecules of a gas are separated from each other by large distances so that the actual volume of the molecule is negligible as compared to the total volume of the gas.

3)The distance of separation between the molecules are so large that the forces of attraction or repulsion between them are negligible.

4)The force of gravitation on the molecule is also supposed to be negligible.

5)The molecules are supposed to be moving continuously in different direction with different velocities. Hence they keep on colliding with one another as well as on the walls of the containing vessel.

6)The molecules are supposed to be perfectly elastic hard sphere so that no energy is wasted when the molecules collide with one another or with the walls of the vessel. The energy may however be transferred from some molecules to the other on collision.

7)Since the molecules are moving with different velocities, they possess different Kinetic energies. However ,the average kinetic energy of the molecules of a gas is directly proportional to the Absolute temperature of the gas.

8)The molecules are supposed to be moving continuously in different direction with different velocities. Hence, they keep on colliding with one another as well as on the walls of the containing vessel.