Noun

(mathematics, fluid dynamics) A property of a fluid flow related to local angular rotation; defined as the curl of the flow's velocity field.

*{{quote-journal, 2009, date=February 20, William M. Durham et al., Disruption of Vertical Motility by Shear Triggers Formation of Thin Phytoplankton Layers, Science citation

, passage=This results from the vorticity component of shear, whereas elongated cells would further be affected by the rate of strain component. }}

*{{quote-magazine, date=2013-03

, author=Frank Fish, George Lauder , title=Not Just Going with the Flow , volume=101, issue=2, page=114 , magazine= citation , passage=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.}}