| 单词 | stefan-boltzmann law |
| 释义 | Stefan-Boltzmann law in British English (ˌstɛfənˈbɔltsman lɔː) noun another name for Stefan's law Stefan's law in British English (ˈstɛfənz) noun 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 physicistStefan-Boltzmann law in American English (ˈstefənˈboultsmən, German ˈʃtefɑːnˈbɔltsmɑːn) noun Physics the law stating that the total energy radiated from a blackbody is proportional to the fourth power of its absolute temperature Also called: Stefan's law of radiation Word origin [1895–1900; named after Josef Stefan (1835–93) and Ludwig E. Boltzmann (1844–1906), Austrian physicists, who independently formulated the law]This word is first recorded in the period 1895–1900. Other words that entered Englishat around the same time include: apothecaries' measure, calling card, cutback, hit-and-run, neon |
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