Question

What happens to conductivity of metals when temperature increases?

Answer 1

if temperature increase then there is change in length

Answer 2

When temperature increses the conductivity of metals will decrease

because for metals, the thermal conductivity is mainly a function of the motion of free electrons. As the temperature increases, the molecular vibrations increase (in turn decreasing the mean free path of molecules). So, they obstruct the flow of free electrons, thus reducing the conductivity.