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Question

It is hotter over the top of fire than at the same distance on the sides because of:

A
Convection of heat
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B
Conduction of heat
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C
Radiation of heat
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D
All of the above
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Solution

The correct option is A Convection of heat
Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises, and hence at the top of the fire, this warm air is felt much compared to the sides.

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