Stefan-Boltzmann law is expressed as

CONCEPT:

• Stefan-Boltzmann law states that the power radiated from a blackbody is directly proportional to the fourth power of absolute temperature and is expressed as 

E = σ eAT4

Where σ = Stefan-Boltzmann constant =5.67× 10^-8 JS-1m-2K-4, e  = Emissivity, T =Temperature

• A black body absorbs all kinds of radiation incident upon it regardless of the frequency of radiation.
• The emissivity of a blackbody is one, e =1.