Question

On the basis of the kinetic theory of matter, explain why does a solid not fill its container completely.

Answer 1

1. The kinetic theory of matter explains the physical properties of matter based on the motion of particles and their relative separation.
2. Based on the kinetic theory, the particles of the solids are closely packed.
3. Thus the intermolecular space between the particles is very less.
4. Since the intermolecular space is very less, there is a strong intermolecular force of attraction between the particles which holds them in a fixed position.
5. So, the particles of the solids can only vibrate about their fixed position. They can not move from one position to another.
6. Thus, a solid can not fill its container completely.
7. But, in the cases of liquids and gases, since the particles can move, they fill their container completely.

Thus, a solid can not fill its container completely because its particles can not move.