| 单词 | wiedemann–franz ratio |
| 释义 | > as lemmasWiedemann–Franz ratio Used as a modifier. Designating or relating to the law that the ratio of the thermal conductivity of a metal to its electrical conductivity is proportional to its temperature, as in Wiedemann–Franz law, Wiedemann–Franz ratio, etc.More precisely, the Wiedemann–Franz law states that k/ σ = LT, where k is the thermal conductivity of the metal, σ its electrical conductivity, T its temperature, and L a numerical constant known as the Lorentz number.Gustav Wiedemann and Rudolph Franz originally claimed only that the ratio of thermal conductivity and electrical conductivity is constant for different metals at the same temperature. It was Danish physicist Ludvig Lorentz (1829–91) who discovered the proportionality of this ratio to temperature and who first formulated the equation characterizing the law. ΘΚΠ the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > capacity for > ratio thermal diffusivity1880 Wiedemann–Franz law1901 Wiedemann–Franz ratio1966 the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > conductive power > law concerning Wiedemann–Franz law1901 the world > matter > physics > electromagnetic radiation > electricity > transmission of electricity, conduction > [noun] > conductive power > ratio Lorenz1922 Wiedemann–Franz ratio1966 1901 Electr. World & Engineer 19 Jan. 134/2 He [sc. Rietsch] tested the Wiedemann-Franz law, according to which the thermic and electric conductivities are proportional. 1966 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. II. xix. 23 The transition metals are also good conductors of heat. On the free-electron theory it is predicted that there should be a direct relation between the thermal, k, and electrical, σ, conductivities, the Wiedemann–Franz ratio. 2005 R. E. Newnham Properties of Materials xviii. 207 The Wiedemann–Franz law..works well for many metals. < as lemmas |
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