# Thermal Diffusivity

Written by Jerry Ratzlaff on . Posted in Thermodynamics

## Thermal Diffusivity

Thermal diffusivity ( $$a$$ ) is a measure of the transient thermal reaction of a material to a change in temperature.

### Thermal Diffusivity formula

$$\alpha = \frac {k} {p Q }$$

Where:

$$\alpha$$ (Greek symbol alpha) = heat transfer rate

$$p$$ = density

$$Q$$ = specific heat capacity

Solve for:

$$k = \alpha p Q$$

$$p = \frac {k} {\alpha Q}$$

$$Q = \frac {k} {\alpha p}$$