Question

Define contraction and expansion
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Answer 1

The increase in size of an object on heating is called expansion whereas the decrease in size of an object on cooling is called contraction.

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Answer 2

Answer:

The increase in size of an object on heating is called expansion whereas the decrease in size of an object on cooling is called contraction

Substances expand (increase in size) when they get warmer, and they contract (decrease in size) when they get cooler. This property can be useful. For example: Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.

Explanation:

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