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σ\sigma
Fundamental Constants

Stefan–Boltzmann Constant

Constant in the Stefan–Boltzmann law of thermal radiation.

SI unit

W m⁻² K⁻⁴ (W/(m²·K⁴))

Dimension: [ MT−3Θ−4 ][\,M T^{-3} \Theta^{-4}\,]

Other units

  • W m⁻² K⁻⁴ (W/(m²·K⁴))

Defined value

Fixed constant from the A-level data sheets.

5.67 × 10-8 W/(m²·K⁴)

A-level value

Appears in 1 equation

Stefan–Boltzmann Law
L=σAT4L = \sigma A T^4

Associated scientists

Ludwig BoltzmannJosef Stefan