Answers are grounded in this paper and cite their sources.
The temperature dependence of the thermal conductivity of indium has been measured in the high-temperature regime for both solid and liquid phases to an accuracy of +or-1%. These data lead to a Wiedemann-Franz ratio that is (i) temperature independent for the solid, (ii) temperature independent for the liquid, and (iii) continuous across the melting point. The value of the measured Wiedemann-Franz ratio is 9% higher than the theoretical Lorenz number.
No takes yet. Share an insight, caveat, or question.
Goldratt et al. (1980) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: