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The unit of thermal conductivity is:

1. J m K⁻¹
2. J m⁻¹ K⁻¹
3. W m K⁻¹
4. W m⁻¹ K⁻¹

Correct answer: W m⁻¹ K⁻¹

Solution

Thermal conductivity is defined as the rate of heat transfer per unit area per unit temperature gradient. Its SI unit is W m⁻¹ K⁻¹.

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