| 单词 |
Stefan |
| 释义 |
Stefan Physics.|ˈstɛfæn|
The name of Josef Stefan (1835–93), Austrian physicist, used attrib. and in the possessive with reference to a law discovered by him (see J. Stefan 1879, in Sitzungsber. der Österreich. Akad. der Wissensch. in Wien LXXIX. 391), as Stefan('s) constant, law = Stefan–Boltzmann constant, law (see next).
1898Sci. Abstr. I. 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. 1923Glazebrook 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. Ibid. IV. 569/1 Apart from this constant Stefan's law leads straight to Maxwell's law of radiation pressure. 1962Newnes Conc. Encycl. Electr. Engin. 718/1 Here ε is the Stefan or total-radiation constant. 1966[see Planck's equation s.v. Planck]. 1979T. 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. |
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