Question

Why thermal conductivity decreases with increase in temperature?

Answer 1

Here is your answer.................
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As the temperature increases, the molecular vibrations increase (in turndecreasing the mean free path of molecules). So, they obstruct the flow of free electrons, thus reducing theconductivity. ... For metals, thethermal conductivity is mainly a function of the motion of free electrons.
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I hope this helps you................. ..........

Answer 2

because the thermal temperaturebis high