Name: Kinds of Clothes We Wear in Summer and Winter
Uploaded: 2019-07-19
Duration: 4 min
Description: In this video, we'll learn the effects of dark and light coloured surfaces on our body temperature. And by doing so, know the appropriate choice of clothing...

Question

Explain thermal expansion in solids with the help of an example.

Accepted Answer

Aim: To demonstrate thermal expansion in solids.
Things needed: An apparatus consisting of a metal ring and a metal ball, Bunsen burner.
Method:
(i) Initially, the ball passes through a ring attached to a stand at room temperature.
(ii) Heat the ball using a Bunsen burner for a few minutes and then try to pass the same ball through the ring.
(iii) Leave the ball for some time and allow it to cool down. Again, try to pass the ball.

Observations:
(i) The heated ball does not pass through the ring as its size increases.
(it) The cooled ball passes easily through the ring as it resumes its initial size.
Conclusion: Solids (ball) expands on heating and contracts on cooling.
When a solid is heated, the movement of the molecules increase and this increases the average distance between the molecules, Therefore the space occupied by the molecules increases.

Explain thermal expansion in solids with the help of an example.

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