convection cell

noun Physics.
a distinct volume of circulating fluid, in a fluid medium under gravity, that is heated from below and cooled from above: usually found in large groupings.
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Main Entry:  convection cell
Part of Speech:  n
Definition:  a self-contained zone in which warmer air in the center is pushed upward and is balanced by the downward motion of cooler air on the periphery
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Example sentences
Probably some unusual convection cell between you and the horizon.
The air above the ocean also warms and rises, starting a convection cell and carrying water vapor with it.
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