Question

GIVE TWO APPLICATIONS OF EXPANSION AND CONTRACTION OF MATERIALS. ​

Answer 1

Answer:

Solids, liquids and gases expand when heated and contract

when cooled.

Examples of expansion and contraction in daily life:-

1) Engines of motor vehicles run when gases expand.

2) When making steel rims for wheels.

3) When the screw-cap of a bottle cannot be opened.

Examples where it is necessary to allow for expansion and

contraction :-

A) When telephone wires are made, they are not pulled

together tightly because on cold days they can contract and

snap.

B) Space is left between rails on a railway line so that the rails

will not bend on a hot day.

C) Oil and steam pipes are made with loops at certain places

to provide for expansion and contraction of the pipes.

Answer 2

Answer:

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