KINETIC MOLECULAR THEORY OF GASES
|Main postulates of kinetic molecular theory of gases are as under:|
|A gas consists of very small microscopic particles called ‘molecules’. Depending upon the nature of gas each gas molecule may consists of an atom or group of atoms. Molecules are in a state of continuous motion.|
|All the molecules of a gas are in stable state and are considered identical.|
| Any finite volume of a gas consists of very large number of molecules.
At S.T.P. there are 3 x 1025 molecules in a cubic meter.
|The molecules are wide separated from each other as compared to their own dimensions.|
|The diameter of a molecule is about 3 x 10-10 meter.|
| Gas molecules move in straight line in all possible directions (random movement) with various
|Gas molecules collide with each other and with the walls of container. There collisions are perfectly elastic in nature.|
|Gas molecules when collide with the walls of container, they transfer their momentum which appears as pressure of gas.|
|Molecules of an ideal gas exert no force of attraction or repulsion on one another except during collision.|
|The average kinetic energy of gas molecules is directly proportional to absolute temperature.|
|At a given temperature, the molecules of all gases have the same kinetic energy.|
|Newtonian mechanics is applicable to molecular motion.|