Question

When the length of a solid rod increases on heating, it is known as _________ expansion.

Answer 1

1. Linear thermal expansion is defined as the increase in the length of any object on heating.
2. The particles get energy from heating and start moving faster.
3. So, the length of the object will increase to provide enough space to move.
4. It occurs in solids only.

Therefore, when the length of a solid rod increases on heating, it is known as linear expansion.