What is thermal expansion? Explain it with the help of experiment.

What is thermal expansion? Explain it with the help of experiment.
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Answer :

The expansion of material objects on heating is called thermal expansion.
I. Take a metallic sphere which can pass easily through a ring. II. Remove the sphere out of the ring. III. Now heat the sphere and put it on the ring. IV. It does not pass through the ring because of expansion due to heating. V. On cooling the sphere, it attracts and passes through the ring again.
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Related questions

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