1. Take a metal ball and a metal ring of suitable diameter.
2. Pass the metal ball through the ring.
3. You can observe that the metal ball can easily go through it.
4. Now heat the metal ball and then try to pass it fits through through the ring.
5. It will not pass through the ring.
6. Keep the metal ball on the ring for some time.
7. In few minutes, it will fall through the ring. Expansion in Solids
8. When the ball is heated the atoms in the ball gain heat energy.
9. They start vibrating and force each other apart.
10. As a result an expansion takes place. That’s why the ball did not go through the ring.
11. After some time, as the ball lost the heat energy to the surrounding it came back to its original size and it went through the ring.
12. This shows that heat energy causes expansion in solids.
