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## Stefan–Boltzmann law

The Stefan–Boltzmann law, also known as Stefans law, is a relation which described 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 (also known as the black-body radiant exitance or emissive power)j,is directly proportional to the fourth power of the black body's thermodynamic temperature.

## $\sigma {t}^{4}$

Here,constant of proportionality Stefan's constant=σ, thermodynamic temperature=t

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