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vortex ring

a stable perturbation in a fluid that takes the form of a torus in which the flow rotates in the section of the torus so that the pressure difference between the inside and outside of the torus balances body forces. The best-known vortex ring is a smoke ring
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Historical Examples
  • Dr. Larmor suggests that a vortex ring may have this constitution in his work on Aether and Matter.

    Aether and Gravitation

    William George Hooper
  • As though it is foolish to follow a vortex ring into a vacuum, and wise to whack at a dirty golf ball on a suburban railway bank.

    Marriage H. G. Wells

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