Visible vortex ring formed by smoke in a clear atmosphere
For other uses, see Smoke ring (disambiguation).
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Smoke ring from a smoke chamberVortex ring from Mount EtnaSmoke rings are also emitted by various types of weapons.
A smoke ring is a visible vortex ring formed by smoke in a clear atmosphere.
Smokers may blow smoke rings from the mouth, intentionally or accidentally. Smoke rings may also be formed by sudden bursts of fire (such as lighting and immediately putting out a cigarette lighter), by shaking a smoke source (such as an incense stick) up and down, by firing certain types of artillery, or by the use of special devices, such as vortex ring guns and vortex ring toys. The head of a mushroom cloud is a large smoke ring.
A smoke ring is commonly formed when a puff of smoke is suddenly injected into clear air, especially through a narrow opening. The outer parts of the puff are slowed by the still air (or by edges of the opening) relative to the central part, imparting it the characteristic poloidal flow pattern.
The smoke makes the ring visible, but does not significantly affect the flow. The same phenomenon occurs with any fluid, producing vortex rings which are invisible but otherwise entirely similar to smoke rings.
Rare visible vortex rings produced by volcanoes have been incorrectly called "smoke rings", despite being formed by the condensation of erupting steam, rather than by combustion.[1]
^"Vortex rings made of water vapour rise from Italy's Mount Etna volcano". ABC News. 8 April 2024. Retrieved 8 April 2024.
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straight or curved. Vortices form in stirred fluids, and may be observed in smokerings, whirlpools in the wake of a boat, and the winds surrounding a tropical...
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