Monday, 28 November 2016


Kinetic Molecular Theory of Gases (KMT)

     A set of postulates that describe the nature and behaviour of an ideal gas is called kinetic molecular theory of gases.
Fundamental Postulates
1. Every gas consists of a large number of very small particles called molecules. Gases like He, Ne, Ar have mono-atomic molecules. 
2. The molecules of a gas move haphazardly, colliding among themselves and with the walls of the container and change their directions. 
3. The pressure exerted by a gas is due to the collision of its molecules with the walls of a container. The collisions among the molecules are perfectly elastic.
4. The molecules of a gas are widely separated from one another and there are sufficient empty spaces among them. 
5. The molecules of a gas have no forces of attraction for each other. 
6. The actual volume of molecules of a gas is negligible as compared to the volume of the gas. 
7. The motion imparted to the molecules by gravity is negligible as compared to the effect of the continued collisions between them. 
8. The average kinetic energy of the gas molecules varies directly as the absolute temperature of the gas. 

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