Question

Explain why :

(a) air is used to inflate tyres.

(b) steel is used to make railway lines.

Answer 1

(a) Air is used to inflate tyres because when we blow air into a tyre the air particles push the tyre walls from inside and exerts pressure on them.This helps the tyre to expand and blow inside out , remain turgid and reduce impact when rolling.

(b) Steel is used to make railway lines because steel is a rigid object having a definite shape and a definite volume.