Question

What happens to a metal ball when it is heated? What does this show?

Answer 1

When metal ball is heated, it expands. This can be proved by following experiment:

Take a metallic ring and ball. Try to pass the metal ball through the ring. The ball is able to pass through the ring. Now heat the metal ball for 5-6 minutes. The hot ball is not able to pass through the ring.

This shows that a solid expands on heating. Now cool the ball, it again passes through the ring. This shows that a solid contacts on cooling.

I	II	III
The metal ball passes through the ring	Metal ball is heated	The metal hall is unnble to pass through the ring after being heated