My name is Alexander FufaeV and here I write about:
Wiedemann-Franz Law: How Electrical and Thermal Conductivity Are Related
The Wiedemann-Franz law is an empirical relationship between the electrical conductivity \( \sigma \) and the thermal conductivity \( \kappa \) of a metal at constant temperature \( T \).
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Here \( L \) is the Lorenz number. It is the proportionality constant between the temperature and the ratio of the conductivities. The unit of the Lorenz number is \( \mathrm{V}^2 / \mathrm{K}^2 \).