| 单词 |
Stefan–Boltzmann |
| 释义 |
Stefan–Boltzmann Physics.|ˈstɛfæn ˈbəʊltsmən|
The names of Josef Stefan (see prec.) and Ludwig Eduard Boltzmann (1844–1906), Austrian physicists, used attrib. with reference to a law independently discovered by them (L. E. Boltzmann 1884, in Ann. der Physik u. Chemie XXII. 291; see also prec.), as Stefan–Boltzmann constant, the constant in the Stefan–Boltzmann law, equal to 5·67 × 10-8 J m-2 s-1 K-4·; Stefan–Boltzmann law, the law which states that the total radiation emitted by a black body is proportional to the fourth power of its absolute temperature.
1898Sci. Abstr. I. 391 The Stefan–Boltzmann law is confirmed to within 3 to 8%. 1915R. A. Houstoun Treat. Light xxv. 448 By considering such a cycle Boltzmann proved that the total radiation from a black body was proportional to the fourth power of its absolute temperature. This law had been stated previously but erroneously by Stefan as holding good for all bodies, and as the amended version was due to Boltzmann, it is very often referred to as the Stefan–Boltzmann law. 1954[see langley]. 1958Condon & Odishaw Handbk. Physics vi. i. 15/1 The total radiation crossing unit area in unit time in all directions in one hemisphere is usually written σT4, where σ is called the Stefan–Boltzmann constant. 1977I. M. Campbell Energy & Atmosphere i. 13 This is related to T through the Stefan–Boltzmann law: E(T) = σT4 where σ is known as the Stefan– Boltzmann constant and has value 5·672 × 10—8 for T in Kelvin and E(T) in Wm—2. |
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