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Question

The heat transfer in air is poor because

A

it takes place mainly due to convection

B

it takes place mainly due to conduction

C

it takes place mainly due to radiation

D

all of the above

Easy

Solution

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Correct option is
A

it takes place mainly due to convection

Air is a gas and its molecules are far apart from each other. So, this is not a good condition for conduction. Also, air being a non-metal doesn't have free electrons for conduction. Hence option B is not applicable.
C is also not applicable because radiation doesn't need any medium. Air being a fluid, convection can take place through it. But convection is not a very fast mode of transfer of heat.

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