Stefan–Boltzmann Law

Stefan-Boltzmann law, states that the total radiant heat energy emitted from a surface is proportional to the fourth power of its absolute temperature.

The radiation energy per unit time from a black body is proportional to the fourth power of the absolute temperature and can be expressed with Stefan-Boltzmann Law as: The Stefan-Boltzmann Constant.

Radiate energy = (Emissivity) * (Stefan-Boltzmann constant) * (Temperature)4 * (Area)

The equation is:

P = є σ T4 A


  • P: Radiate energy
  • σ: The Stefan-Boltzmann Constant
  • T: absolute temperature in Kelvin
  • є: Emissivity of the material.
  • A: Area of the emitting body

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