Question

4) What is thermal expansion? Give one example in support of your answer .​

Answer 1

Answer:

Automatic fire alarm is an example of expansion on heating, which is put to good use. The fire alarm works on the principle that different solids expand differently when heated. An automatic fire alarm consists of a bimetallic strip which have two different metals strips, iron and brass, bolted together firmly.

Answer 2

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature, through heat transfer.

Example-: Have expansion joints to allow them to freely expand and contract with temperature changes.