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Thermal Convection

Convection is one of the modes of thermal transfer.

A gas or a fluid becomes less dense when it is heated. It then has a tendency to rise, and float on top of the more dense, colder regions. This explains the phenomenon of convection currents.  This mixing enables the heating of an entire room with a single radiator or the entire volume of water in a pot by heating only the bottom of that pot.

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