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

The amount by which the volume of a material increases when the temperature is raised to one degree is called the coefficient of volumetric expansion.

The coefficient of volumetric expansion can be represented by the symbol γ (gamma).


Volume expansion

Consider a material with the volume of V1 at t1o \(c\) and the material is heated upto t2o \(c\). Now, the volume of the material is V2.

Let γ be the coefficient of cubical expansion.

We know that,

The change in volume \(ΔV\) is proportional to original volume V1, rise in temperature \(ΔT\), and material type.


Rearranging the above equation,


Relation between α,βandγ: