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Question
What happens to a metal ball when it is heated? What does this show?
Solution
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.
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| 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 |
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