It is hotter at the same distance over the top of a fire than it is on the side of it mainly because:

Heat is radiated upwards

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Air conducts heat upwards

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Convection takes more heat upwards

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Conduction, convection and radiation all contribute significantly in transferring heat upwards.

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Solution

The correct option is C Convection takes more heat upwards
As we know that heat currents in convection process always move upwards not sidewards; so heat intensity in this process is more in upperside.

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