define thermal conductivity and electrial conductivity. obtain weidman franz law for the thermal and electrical conductivity of metal?
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In physics, the Wiedemann–Franz law states that the ratio of the electronic contribution of the thermal conductivity (κ) to the electrical conductivity (σ) of a metal is proportional to the temperature (T). ... The proportionality of κ/σ with temperature was discovered by Ludvig Lorenz in 1872.
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