To give such insulation how thick would a layer of a, Physics

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To give such insulation how thick would a layer of a

The ceiling of a single-family dwelling in a cold climate should have an R-value of 20 m²K/W. To give such insulation, how thick would a layer of (a) polyurethane foam and (b) silver have to be? The thermal conductivity of polyurethane foam is 0.024 W/mK, and the thermal conductivity of silver is 428 W/mK.

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