# Area Thermal Expansion Coefficient

on . Posted in Thermodynamics

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

$$\large{ \alpha_a = \frac { 1 }{ A } \; \frac {\Delta A } {\Delta T} }$$
Symbol English Metric
$$\large{ \alpha_a }$$   (Greek symbol alpha) = area thermal expansion coefficient $$\large{ \frac{in^2}{in^2\;F} }$$ $$\large{ \frac{mm^2}{mm^2\;C} }$$
$$\large{ A }$$ = area of the object $$\large{in^2}$$ $$\large{mm^2}$$
$$\large{ \Delta A }$$ = area differential $$\large{in^2}$$ $$\large{mm^2}$$
$$\large{ \Delta T }$$ = temperature differential $$\large{F}$$ $$\large{C}$$