# Linear Thermal Expansion Coefficient

Written by Jerry Ratzlaff on . Posted in Thermodynamics

## Linear Thermal Expansion Coefficient

Linear thermal expansion coefficient ( $$\alpha$$ ) (also known as coefficient of linear thermal expansion) is the ratio of the change in size of a material to its change in temperature.

### Linear Thermal Expansion Coefficient FORMULA

$$\large{ \alpha_l = \frac { 1 }{ l } \frac {\Delta l } {\Delta T} }$$

Where:

$$\large{ \alpha }$$   (Greek symbol alpha) = linear thermal expansion coefficient

$$\large{ l }$$ = length of the object

$$\large{ \Delta l }$$ = Length differential

$$\large{ \Delta T }$$ = temperature differential