Stefan–Boltzmann constant
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https://doi.org/10.1351/goldbook.S05964
Fundamental physical constant σ = 2 π 5 k 4 15 h 3 c 0 2 = 5.6.
Source:
CODATA Bull. 1986,
63
, 1 (https://doi.org/10.6028/jres.092.010)