Which of the following walls (identical areas) would be the best thermal INSULATOR? (thermal conductivities, k, are given in J/m-s-C°)
A) 20. feet of iron (k = 46.)
B) 5.0 inches of concrete (k = 1.3)
C) 1.0 inch thick wood (k = 0.12)
D) 6.0 inches of solid glass (k = 0.84)
Correct Answer:
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