<P> The Stefan--Boltzmann law describes the power radiated from a black body in terms of its temperature . Specifically, the Stefan--Boltzmann law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time j ⋆ (\ displaystyle j ^ (\ star)) (also known as the black - body radiant emittance) is directly proportional to the fourth power of the black body's thermodynamic temperature T: </P> <Dl> <Dd> j ⋆ = σ T 4 . (\ displaystyle j ^ (\ star) = \ sigma T ^ (4).) </Dd> </Dl>

What is the stefan's law of black body radiation
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