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**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 formula; K / σ = L x T

The proportionality constant L, known as the Lorenz number, is

L = K / σ x T = ( π^{2} / 3 ) x ( k_{B} / e )^{2}

L = 2.44 x 10^{-8} W Ω K^{-2}

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