Question

Give two examples from daily life experience where expansion and contraction of metal are utilized?​

Answer 1

Answer:

The jammed metal lid of a jam jar can be expanded and opened by heating. In many thermometers, mercury is used.

Answer 2

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.


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