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Question

Physics Question on Heat Transfer

The unit of thermal conductivity is

A

Wm−1K−1Wm^{-1}K^{-1}

B

JK−1JK^{-1}

C

WmK

D

JK

Answer

Wm−1K−1Wm^{-1}K^{-1}

Explanation

Solution

Thermal conductivity =ΔQtAΔθ=\frac{\Delta Q}{t A \Delta \theta} =Jmm2sK=Wm−1K−1=\frac{J m}{m^{2} s K}=W m^{-1} K^{-1}