# Area Thermal Expansion Coefficient

Area thermal expansion coefficient, abbreviated as \(\alpha_a\) (Greek symbol alpha), also known as coefficient of aerial thermal expansion, is the ratio of the change in size of a material to its change in temperature.

### Area Thermal Expansion Coefficient FORMULA

\(\large{ \alpha_a = \frac { 1 }{ A } \; \frac {\Delta A } {\Delta T} }\)

Where:

\(\large{ \alpha_a }\) (Greek symbol alpha) = area thermal expansion coefficient

\(\large{ A }\) = area of the object

\(\large{ \Delta A }\) = area differential

\(\large{ \Delta T }\) = temperature differential

Tags: Equations for Thermal