Which of the above has the lowest thermal conductivity? a) Copper. c) Iron. b) Aerated brick. d) Vacuum e) Air
December 31, 2020
Vacuum has the lowest thermal conductivity.
This can be confirmed by the coefficient of thermal conductivity of the material:
clay porous brick = 0.26 W / (m * C)
copper = 386.9 W / (m * C)
iron = 74.4 W / (m * C)
air = 0.025 W / (m * C)
vacuum = 0 W / (m * C)
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