Question

what is the reason of electrical and thermal conductivies of metal ?​

Answer 1

Answer:

According to Wiedemann -Franz law, free electrons in the metal are involved in the mechanisms in both heat and electrical transport. The thermal conductivity increases with the average electron velocity since this increases the forward transport of energy. However, the electrical conductivity decreases with an increase in particle velocity because the collisions divert the electrons from forward transport of charge.For this reason metals can conduct electricity and thermal.

Explanation: