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Question

Woolen fabric doesn't let the body heat escape into atmosphere. How does this happen ?

A
The woolen fabric is a good conductor of heat and allows passage of warm air.
B
The woolen fabric is a bad conductor of heat and traps a air layer. This air allows passage of warmer air from body to atmosphere.
C
The woolen fabric is an insulator of heat and traps a layer of air in its fabric layer. Air being an insulator doesn't allow body heat to escape into atmosphere.
D
None of the above
Solution
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Correct option is C. The woolen fabric is an insulator of heat and traps a layer of air in its fabric layer. Air being an insulator doesn't allow body heat to escape into atmosphere.

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