smoke ring

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smoke ring ‎(plural smoke rings)

  1. A smoking trick where one blows or exhales rings of smoke.
    • 2013 March 1, Frank Fish, George Lauder, “Not Just Going with the Flow”, American Scientist, volume 101, number 2, page 114: 
      An extreme version of vorticity is a vortex. The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in smoke rings, tornados and hurricanes.
    A smoke ring persists for a surprisingly long time, illustrating the slow rate at which viscosity dissipates the energy of a vortex.