Wiedemann–Franzn.

Brit.

/ˌviːdəmənˈfrants/, U.S.

/ˌvidəmənˈfrænts/,

/ˌvidəmənˈfrɑnts/

Forms: 1900s– Wiedemann–Frantz (nonstandard), 1900s– Wiedemann–Franz.

Origin: From proper names. Etymons: proper names Gustav Heinrich Wiedemann, Rudolph Franz.

Etymology: < the names of Gustav Heinrich Wiedemann (1826–99) and Rudolph Franz (1826–1902), German physicists, who published the law in 1853 ( Ann. d. Physik 89 497).With Wiedemann–Franz law compare German Wiedemann-Franzsches Gesetz (1874 or earlier).

Physics.

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.

This entry has been updated (OED Third Edition, December 2019; most recently modified version published online December 2021).

单词	wiedemann–franz
释义	Wiedemann–Franzn. Brit. /ˌviːdəmənˈfrants/, U.S. /ˌvidəmənˈfrænts/, /ˌvidəmənˈfrɑnts/ Forms: 1900s– Wiedemann–Frantz (nonstandard), 1900s– Wiedemann–Franz. Origin: From proper names. Etymons: proper names Gustav Heinrich Wiedemann, Rudolph Franz. Etymology: < the names of Gustav Heinrich Wiedemann (1826–99) and Rudolph Franz (1826–1902), German physicists, who published the law in 1853 ( Ann. d. Physik 89 497).With Wiedemann–Franz law compare German Wiedemann-Franzsches Gesetz (1874 or earlier). Physics. 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. This entry has been updated (OED Third Edition, December 2019; most recently modified version published online December 2021). < n.1901
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