Question

4. Give two examples from daily life experiences where expansion and contraction of metal are utilized.
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Answer 1

The jammed metal lid of a jam jar can be expanded and opened by heating.

In many thermometers, mercury is used

Answer 2

electric wires of street.......and bridges made of metal attached with rollers at the end to allow thermal expansion or contraction.....we can also see this in railway tracks seperated by wooden planks to allow thermal expansion or contraction