Question

Distinguish between linear, arial, and superficial expansion.

Answer 1

Linear expansion	Cubical expansion	Superficial expansion
When a body is heated or cooled, the length of the body changes due to a change in its temperature.	If there is an increase in the volume of a solid body due to heating, it is called cubical expansion.	If there is an increase in the area of a solid object due to heating, then the expansion is called superficial expansion.
The ratio of increase in the length of the body per degree rise in temperature to its unit length.	The ratio of increase in the volume of the body per degree rise in temperature to its unit volume is called a coefficient of cubical expansion.	The ratio of increase in the area of the body per degree rise in temperature to its unit area is called a coefficient of superficial expansion.