Question

which is coloured by red please tell me the question ​

Answer 1

Answer:

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.

Answer 2

Answer:

The increase in the 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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