In quantum physics, the **Stefan-Boltzmann law** (sometimes called **Stefan's Law**) states that the black-body radiation energy emitted by a given object is directly proportional to the temperature of the object raised to the fourth power. The equation for this law is:

R=σ*T*^{4}

where σ is the **Stefan-Boltzmann constant**, which is equal to 5.670 373(21) x 10^{-8} W m^{-2} K^{-4}, and where R is the energy radiated per unit surface area and per unit time. *T* is temperature, which is measured in Kelvin scale. Although this law is accurate and helpful, it is only usable for the energy radiated by blackbodies.

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