See also
In metals, thermal conductivity approximately tracks electrical conductivity according to the Wiedemann–Franz law, asfreely moving valence electrons transfer not only electric current but also heat energy. However, the general correlationbetween electrical and thermal conductance does not hold for other materials, due to the increased importance ofphonon carriers for heat in non-metals. Highly electrically conductive silver is less thermally conductive than diamond,which is an electrical insulator, but due to its orderly array of atoms it is conductive of heat via phonons.
