Question

What is expention and contaction​

Answer 1

Answer:

Expansion and 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.

Answer 2

Answer:

First of all yout spelling is wrong.

Its expansion and contraction

Step-by-step explanation:

The process by which a body expands due heat energy is called expansion

The process bywhich a body contracts due to coldness is called contraction

Eg-the wires hanging between poles