Stefan–Boltzmann constant 

https://doi.org/10.1351/goldbook.S05964
Fundamental physical constant σ=2 π5 k415 h3 c02=5.670 51(19)×10−8 W m−2 K−4.
Source:
CODATA Bull. 1986, 63, 1 [Terms] [Book]
Citation: 'Stefan–Boltzmann constant' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05964 RIS BibTex EndNote
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Last revised: February 24, 2014