Question

Give some applications of expansion of solids give only 2​

Answer 1

Answer:

In physics, Thermal expansion can be defined as the change in the length, width, height, or volume of any material on changing the temperature. Thermal expansion is very evident in solids as atoms are densely packed. Thermal expansion of solids has loads of applications in day to day life.

Thermal Expansion in Metals

It is a well-known phenomenon now that substances expand on heating and contract on cooling. If you heat a body, it alters its dimensions. Depending on the shape of the body.

The expansion can occur in length in which case it is called Linear Expansion.

If we take a square tile and heat it, the expansion will be on two fronts, length and breadth, here it is called Area Expansion.

If we take a cube and heat it, all its sides expand and now the body experiences an increase in the overall volume due to this and it is called Volume Expansion.

Answer 2

Following are the advantages of thermal expansion:

(1) If we find it difficult to remove the stopper from a glass bottle, we can heat the neck of the bottle. Now the neck of the bottle expands and the stopper comes out easily.

(2) The principle of thermal expansion is used in fixing iron rim with the wooden wheel firmly.

(3) Rivets are used to hold steel plates together very tightly. A very hot rivet is pushed through the two plates and its end is hammered over. When the rivets cools down it pulls the two plates together very tightly.