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Distinguish between linear, areal and cubical expansion.
 
Linear expansions:

When we heat a solid, if there is an increase in the body's , this is called Linear expansion. It is also known as expansion.

Areal expansions:

When we heat a solid, if there is an increase in the of the body, this is called Areal expansion. It is also known as expansion. 

Cubical expansions:

When we heat a solid, if there is an increase in the of the body, this is called Cubical expansion. It is also known as expansion.