Some important things about IDEAL GAS

The experiments on the conversion of work into heat have shown clearly that heat is a form of energy. This energy is connected with the motion of molecules of which the matter is made of. Kinetic theory of matter gives an explanation to the nature of this motion and the nature of heat energy.

According to kinetic theory of matter, every substance consists of a very large particles of a substance that can exist in free state. the molecules posses there characteristics properties of the parent substance. the molecules are in a state of continuous motion with all possible velocities. The velocity of the molecules increases with rise in temperature.

The energy possessed by the molecules can be two forms, kinetic or potential. when the stopcock of an evacuated flask is opened , air rushes in quickly to fill in the space. this shows that the molecules posses rapid motion and hence they posses kinetic energy. when a solids expand on heating, the molecules are pulled apart against the force of intermolecular attraction. the amount of work done in separating the molecules to larger distances manifests itself as the potential energy of the molecules. Thus the amount of heat given to a solid substance increases the energy of the molecules and this increase the energy is partly kinetics and partly potential.

Thus , the kinetic theory of matter is based on the following three points , first is that the matter is made up of molecules , second is molecules are in rapid motion and the third is molecules experience forces of attraction between one another.

the validity and the soundness of any theory depends on its capability to explain the observed facts ; for example the three states of matter , expansion, change of state and conduction.