The Kinetic Molecular Theory 

The Kinetic Molecular Theory states that “the particles that the matter is made up with are always moving and they often bump into each other”.  This random motionMotion is the act of changing location from one place to ano... is present in varying amount in solids, liquids and gases. The assumptions of kinetic theory of matter can be summarised in the following points:

• All matter is made up of particles called molecules. In normal circumstances it exists in three states.
• All the molecules of a given substance are alike in all respects.
• The molecules are separated from one another by the intermolecular space which is more than the diameter of the molecule itself.
• The molecules attract each other with a forceIn physics, a force is any influence that causes a free body... called inter-molecular forceIn physics, a force is any influence that causes a free body..., which is strongest in solids and weakest in gases.
• Molecules are in constant motionMotion is the act of changing location from one place to ano....
• The temperature of a substance is proportional to the average kinetic energy of all the molecules of the substance.