Stefan–Boltzmann constant
W/(m²·K⁴)
The Stefan–Boltzmann constant gives the power radiated per unit area by a blackbody at temperature T: P/A = σT⁴. It connects thermodynamics to electromagnetic radiation and is exact in the revised SI.
Used in
- Blackbody radiation law P = σAT⁴
- Estimating star luminosities from surface temperature
Source: SI defining constants / CODATA 2018