Physics - Heat & Thermo Question with Solution | TestHub

Thermal resistance $R_{th}$ is given by $R_{th}=\frac{L}{KA}$. Thermal resistance per unit area is $\frac{R_{th}}{A}=\frac{L}{K}$. Given $L=10\text{ cm}=0.1\text{ m}$ and $K=0.5{\text{ W m}}^{-1}{\text{ K}}^{-1}$.$\frac{R_{th}}{A}=\frac{0.1\text{ m}}{0.5{\text{ W m}}^{-1}{\text{ K}}^{-1}}=0.2{\text{ m}}^2{\text{ K W}}^{-1}$.