vorticity

[vawr-tis-i-tee]
noun, plural vorticities. Mechanics.
a measure of the circulation of a fluid: a quantity equal to twice the angular momentum of a particle of the fluid around which there is circulation.

Origin:
1890–95; < Latin vortic- (stem of vortex; see vortex) + -ity

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In reality, it's the clash between warm air and cold air plus vorticity that
  causes storms.
From a limited number of observations it appears that vorticity is a common
  feature in the inner plasma sheet.
The vertical vorticity is then intensified as it becomes stretched by strong
  updrafts fueled by environmental instability.
The main focus of the researchers has been on the application of the concept of
  potential vorticity tendency.
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