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vortex ring

From Wiktionary, the free dictionary

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English

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Noun

vortex ring (plural vortex rings)

  1. A toroidal vortex in a fluid or gas, i.e. a region where the fluid mostly spins around an imaginary axis line that forms a closed loop.
    Vortex rings are rarely noticed unless the motion is revealed by suspended particles, as in smoke rings.

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