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A vortex is a turbulent flow which resembles a tornado. Or, maybe it is better to say that a tornado is a well known example of a large vortex. A vortex is also formed as water goes down a drain, as in a sink or a toilet.

Examples

• Lift (force) of a wing (which relates to the aspect ratio of the wing).
• The primary cause of drag in the sail of a sloop
• Sunspot
• Tornado
• Whirlpool[?]

See also

• Strouhal number