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Stefan's law

the principle that the energy radiated per second by unit area of a black body at thermodynamic temperature T is directly proportional to T4. The constant of proportionality is the Stefan constant, equal to 5.670400 × 10–8 Wm–2 K–4 Also called Stefan-Boltzmann law
Word Origin
C19: named after Josef Stefan (1835–93), Austrian physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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