Stefan-Boltzmann Law

P = ϵ σ A T^{4}

Power radiated by a body due to its temperature.

Variables

P

Radiated power

Energy per second

W

ε

Emissivity

0 to 1 (1 for blackbody)

unitless

σ

Stefan-Boltzmann constant

5.67×10⁻⁸

W/(m²·K⁴)

A

Surface area

Radiating surface

m²

T

Temperature

Absolute temperature

K

Derivation

Derived from Planck blackbody radiation law.

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