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Two different materials (A and B) are being considered as insulation for a winter coat.
Material A was shown to maintain a 25 °C difference across an 8-mm thickness with a
heat flux of 60 W/m².
a) Calculate the thermal conductivity of material A.
b)
If material B has thermal conductivity of 0.03 W/mK, determine the thickness of
material B required to maintain the same temperature difference for the same heat
flux.

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