Question

__________ and __________ thermal expansions occur in solids.

• A. Linear
• B. Superficial

Answer 1

1. When the length of a solid rod increases on heating, it is known as linear expansion.
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.
5. Increase in the area happens in superficial thermal expansion on heating.
6. It occurs in solids only. An increase in the area of a metal rod is an example of superficial thermal expansion.
7. Therefore, linear and superficial thermal expansions occur in solids.