Kinetic theory of gases

Postulates of kinetic theory
The kinetic theory of gases states that a gas consists of a large number of particles called molecules. The moles are randomly moving continuously in all directions and hence collide with themselves and with walls of the container is due to the continuous bombardment of the molecules. The following assumptions are known as postulates of kinetic theory of gases.

1. A gas consists of a large number of small particles called molecules.
2. The molecules are perfectly elastic spheres.
3. The volume of molecules is negligible as com rared to the volume of gas.
4. The molecules of the gas are continuously moving randomly in all directions and with all velocities.
5. There exists no force of attraction between the molecules.
6. The molecules of the gas collide elasticity with themselves and with the walls of the container.
7. The effects of gravity on the molecules is negligible.
8. A molecule moves in straight line between collions.
   
9. The average kinetic energy of the gas molecules is proportional to the absolute temperature.