vortex ring


noun

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

QUIZZES

PRACTICE SOME ESCAPISM WITH THIS WORD OF THE DAY QUIZ!

We salute you if you remember all the doovers from Word of the Day between May 25 and May 31!
Question 1 of 7
salute
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example sentences from the Web for vortex ring