Stefann.
/ˈstɛfan/ Physics.
Used attributively and in the possessive with reference to a law discovered by Stefan (see J. Stefan 1879, in Sitzungsber. der Österreich. Akad. der Wissensch. in Wien LXXIX. 391).
a. Stefan law n. (also Stefan's law) = Stefan–Boltzmann law n. at Stefan–Boltzmann n. a.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > [noun] > Stefan-Boltzmann law
Stefan–Boltzmann law1898
Stefan law1898
1898 Sci. Abstr.: Physics & Electr. Engin. 1 391 The author's attempt to realise Kirchhoff's conception of an equivalent to an absolutely black body in the shape of a uniformly heated hollow space with a small opening, and test Stefan's law, which maintains that the radiation of such a body is proportional to the 4th power of its absolute temperature.
1923 R. Glazebrook Dict. Appl. Physics IV. 569/1 Apart from this constant Stefan's law leads straight to Maxwell's law of radiation pressure.
1966 M. Ferro-Luzzi tr. E. Fermi Molecules, Crystals & Quantum Statistics vii. 223 From the Planck equation, we can easily deduce Stefan's law, which also can be obtained by thermodynamic arguments alone.
1979 T. B. Akrill et al. Physics xxviii. 377/2 For a non-black or ‘grey’ body we can apply Stefan's law in the form Ptot = εσAT4, where ε is called the total emissivity of the body and is a number always less than 1.
b. Stefan constant n. (also Stefan's constant) = Stefan–Boltzmann constant n. at Stefan–Boltzmann n. b.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > [noun] > Stefan-Boltzmann law > constant in
Stefan constant1923
Stefan–Boltzmann constant1954
1923 R. Glazebrook Dict. Appl. Physics III. 711/1 By the Stefan-Boltzmann law.., and a knowledge of Stefan's constant, the whole radiation from the blackened surface is known.
1962 Newnes Conc. Encycl. Electr. Engin. 718/1 Here ε is the Stefan or total-radiation constant.
This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2018).
<
n.1898