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Heat and Thermodynamics by Anandamoy Manna

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11.12 Wiedemann-Franz Law

Wiedemann-Franz law states that the ratio of the thermal (K) to electrical conductivities (σ) is the same for all metals at the same temperature.

 

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Lorentz extended it by adding that the value of the ratio is proportional to absolute temperature

 

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Drude gave a mathematical deduction based on the assumption that the presence of free electrons inside metals is responsible for the thermal and electrical conductivities. He further assumed that these free electrons behave like gas molecules and that the law of equipartition ...

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