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[[Image:lighterstill.jpg]]
[[Image:lighterstill.jpg]] [[Image:Flowsmall.jpg|right]]
[[Image:Flow.jpg|right]]
A '''vortex''' (pl. ''vortices'') is a [[Rotation|spinning]], often [[Turbulence|turbulent]],
A '''vortex''' (pl. ''vortices'') is a [[Rotation|spinning]], often [[Turbulence|turbulent]],
flow of [[fluid]]. Any [[spiral]] motion with closed [[Streamlines, streaklines and pathlines|streamlines]] is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex. The speed and rate of [[rotation]] of the fluid are greatest at the center, and decrease progressively with distance from the center.
flow of [[fluid]]. Any [[spiral]] motion with closed [[Streamlines, streaklines and pathlines|streamlines]] is vortex flow. The motion of the fluid swirling rapidly around a center is called a vortex. The speed and rate of [[rotation]] of the fluid are greatest at the center, and decrease progressively with distance from the center.