Question

How is Thermal Conductivity and Electrical Conductivity related.

Answer 1

Because the accurate determination of thermal conductivity is a demanding task (often not recognized by either designers or vendors), methods, based on the measurement of another physical property that is uniquely coupled to thermal conductivity, are very challenging.

The relationship holds only for materials with more or less freely moving electrons; in other words, metals (at least at room temperature). 

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Answer 2

hope it helps you thank you so much Radhe Radhe