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Which law governs the thermal conductivity?

a) Fourier’s law
b) Pascal law
c) Newton law
d) Planks law

Answer: a
Explanation: The Fourier’s law governs the thermal conductivity. This law states that the time rate of heat transfer through a material is directly proportional to the negative gradient in the temperature and to area, at its right angle to that gradient through which the heat flows.

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