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:

 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 \(\large{\frac{Btu}{hr-ft^2-R^4}}\) \(\large{\frac{W}{m^2-K^4}}\)

 

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Tags: Equations for Temperature Equations for Energy Equations for Electrical