# Stefan-Boltzmann Law

Written by Jerry Ratzlaff on . Posted in Electromagnetism

Stefan-Boltzmann law describes the power radiated from a black body, an ideal black surface that absorbs all radiant energy falling on it, in terms of temperature.

## Stefan-Boltzmann Law formula

 $$\large{ P = \epsilon \; \sigma \; A \; T^4 }$$

### Where:

$$\large{ P }$$ = radiated energy

$$\large{ T }$$ = absolute temperature of the object emitting

$$\large{ \epsilon }$$  (Greek symbol epsilon) = emissivity of the material

$$\large{ A }$$ = radiating area

$$\large{ \sigma }$$  (Greek symbol sigma) = Stefan-Boltzmann constant