The Stefan-Boltzmann law states that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature.
where E is the power from a unit area, T is the absolute temperature and the Greek letter sigma (σ) representing the constant of proportionality, called the Stefan-Boltzmann constant. In SI units, this constant has the value .
The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.
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