Kinetic Theory of an Ideal Gas
Basis of Kinetic Theory: -
- Molecules of gas are in incessant random motion,colliding against one another
andwith the walls of the container.
- All collisions are elastic.
- Total Kinetic energy is conserved.
- Total momentumis conserved.
- In case of an elastic collision total Kinetic energy and momentum before collision is equal to the total Kinetic energy and momentum after collision.
What does Kinetic Theory tells?
- At ordinary temperature and pressure the molecular size is very small as compared to inter molecular distance between them.
- In case of gas, molecules are very far from each other and the size of molecules is small as compared to the distance between them.
- As a result, interaction between them is negligible. As there is no interaction between the molecules, there will be no force between the molecules.
- As a result molecules are moving freely as per newton’s first law of motion.
- The molecules should move along straight line but when they come closer they experience the intermolecular forces and as a result their velocities change.
- This phenomenon is known as collision.These collisions are elastic.
Molecules moving randomly
Molecules colliding with each other
Molecules change their direction after colliding