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Stefan-Boltzmann law

One of the radiation laws that states that the amount of energy radiated per unit time from a unit surface area of an ideal blackbody is proportional to the fourth power of the absolute temperature of the blackbody. This law was established experimentally by Stefan and was given theoretical support by thermodynamic reasoning of Boltzmann. This law may be deduced by integrating Planck's law over the entire frequency spectrum.

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