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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Contemporary definitions for convection cell

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's 21st Century Lexicon
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