Question

For which substance conductivity increases with increase in temperature

Answer 1

Conductivity of metals will increase with increase in temperature because due to increase in temperature electrons will become free to move as well as to conduct electricity

Answer 2

Thermal conductivity: Thermal conductivity is the ability to conduct heat energy.

The thermal conductivity of the metals decreases with the increase in temperature as the no of free electrons increases.

When iron is heated, initially, the thermal conductivity reduces as the free electrons expand. But, upon continuous heating, the thermal conductivity of iron increases.

Hence, iron is the answer.

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