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Question
Which one of the following statements about thermal conductivity is correct? Give reason.
Options
Steel > Wood > Water
Steel > Water > Wood
Water > Steel > Wood
Water > Wood > Steel
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Solution
Steel > Water > Wood
Reason:
Thermal conductivity is defined as the heat flow per unit time.
Steel has a higher thermal conductivity than water and wood.
[Thermal conductivity of steel = 50.2 w/mk
Thermal conductivity of water = 0.6 w/mk Thermal conductivity of wood = 0.12 w/mk]
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