Stefan-Boltzmann Law

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.

• See Stefan-Boltzmann constant value

 

Stefan-Boltzmann Law formula

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

Where:

Units	English	Metric
\(\large{ P }\) = radiated energy	\(\large{lbf-ft}\)	\(\large{J}\)
\(\large{ T }\) = absolute temperature of the object emitting	\(\large{R}\)	\(\large{K}\)
\(\large{ \epsilon }\)  (Greek symbol epsilon) = emissivity of the material	\(\large{R}\)	\(\large{K}\)
\(\large{ A }\) = radiating area	\(\large{ft^2}\)	\(\large{m^2}\)
\(\large{ \sigma }\)  (Greek symbol sigma) = Stefan-Boltzmann constant	\(\large{\frac{Btu}{hr-ft^2-R^4}}\)	\(\large{\frac{W}{m^2-K^4}}\)