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A 'thermal loop' is a movement of air driven by warm air rising at one end of the loop, and cool air descending at the other end, creating a constantly moving loop of air. Thermal loops also occur in liquids.
Thermal loops are size-independent; that is to say, they may occur in a space as small as a room or as large as a global hemisphere. The Hadley cell is an example of a global-scale thermal loop.