The heat flux through a wood slab (50 mathrm{~mm}) thick, whose inner and outer surface temperatures are

Question:

The heat flux through a wood slab $50 \mathrm{~mm}$ thick, whose inner and outer surface temperatures are 40 and $20^{\circ} \mathrm{C}$, respectively, has been determined to be $40 \mathrm{~W} / \mathrm{m}^{2}$. What is the thermal conductivity of the wood?

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