Question

iron rims are heated red hot before fixing them on cart wheels give reason

Answer 1

Usually, before fixing them on wheels of the cart, the iron rims are generally heated red hot.

This is because that the contraction of metals occurs on cooling and expansion of it occurs on heating.

This change is usually a kind of reversible change.

The size of the metallic rim is smaller in size than the normal wheels.

The rim expands on heating and it usually lies on the wheels of the cart.

It usually presses tightly on to the wheels and it contrasts on cooling the rim.