One experimental method of measuring an insulating material\'s thermal conductiv

Question

One experimental method of measuring an insulating material's thermal conductivity is to construct a box of the material and measure the power input to an electric heater inside the box that maintains the interior at a measured temperature above the outside surface. Suppose that in such an apparatus a power input of 170W is required to keep the interior surface of the box 65.0C? ( about 149F? ) above the temperature of the outer surface. The total area of the box is 2.00m2 , and the wall thickness is 3.60cm

Find the thermal conductivity of the material in SI units.

Explanation / Answer

P = kAT/d

170 = k*2*(273+65)/(3.6*.01) , then k = 9.05*10^-3 W/mK

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