The flame of a candle is always upright due to ___________.

Convection

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Chemical energy

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Air drag

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Conduction

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Solution

The correct option is A
Convection

The gases inside the flame have a temperature much higher than the surrounding air and thus have a lesser density. So the air around the flame tends to move downwards and the gases in flame move upwards. This upward movement of gases inside flame always keeps it upright.

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