Smoke ring. This is a poloidal (rotating) vortex flow that is stable for considerable distances in still air. The rotating flow is maintained by the viscous friction between the moving ring and the stationary air outside it. Clipart

Clipart - Smoke ring. This is a poloidal (rotating) vortex flow that is stable for considerable distances in still air. The rotating flow is maintained by the viscous friction between the moving ring and the stationary air outside it.. Fotosearch

Smoke ring. This is a poloidal (rotating) vortex flow that is stable for considerable distances in still air. The rotating flow is maintained by the viscous friction between the moving ring and the stationary air outside it.

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Keywords
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