Question

Give reason,

A blacksmith heats the metal rim to fix it on the cartwheel

Answer 1

Explanation:

A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

Answer 2

Metals have a property, that they expand when they are heated.

Heating the metal rim expands its size slightly, due to which it is easily fixed in the cartwheel.

After the metal rim cools down it is tightly fixed in the cartwheel.

On this principle, the rim is made quite smaller than its actual size too.