"vorticity" meaning in English

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      "derived": [
        {
          "word": "potential vorticity"
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          "ref": "2004, Zhu Xun, Li Xiaofan, Cai Ming, Observation, Theory And Modeling Of Atmospheric Variability, →ISBN, page 13:",
          "text": "It might sound puzzling that the ageostrophic geopotential (or the ageostrophic pressure in z-coordinate) has no impact on the evolution of the vorticity of a quasi-geostrophic disturbance and yet it affects the perturbation kinetic energetics (not globally but locally).",
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          "text": "This results from the vorticity component of shear, whereas elongated cells would further be affected by the rate of strain component.",
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          "ref": "2013 March 29, Frank Fish, George Lauder, “Not Just Going with the Flow”, in American Scientist, volume 101, number 2, archived from the original on 2013-05-01, page 114:",
          "text": "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.",
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        "A property of a fluid flow related to local angular rotation; defined as the curl of the flow's velocity field."
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        "(mathematics, fluid dynamics) A property of a fluid flow related to local angular rotation; defined as the curl of the flow's velocity field."
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