**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 T^{4} A

**Where:**

- 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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