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Convection is the movement of heat by a medium, such as a gas or liquid, which picks up heat from a hot place and transfers it to a cooler place.

what it really is cycles, of heat. The rule basically states that the hot gas or liquid will always go up, since it is less dense than, cold gas or liquid, which always goes down. This cycle repeats; it just doesn't stay there, it travels through literal cycles. Imagine the signs on the recycling bin. The hot substance is up and the cold down (sometimes the heat circles the whole, say, house but with different temperatures).

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