stefans law

World English Dictionary
Stefan's law (ˈstɛfənz)
 
n
Also called: Stefan-Boltzmann 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
 
[C19: named after Josef Stefan (1835--93), Austrian physicist]

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