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Question

The moving away of molecules close to a source of heat and of those molecules which are away from the source of heat towards the source is called ____________.


A

Convection

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B

Diffusion

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C

Conduction

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D

Explosion

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Solution

The correct option is A

Convection


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.


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