### vortensity

**(PV, potential vorticity)**
(ratio of vorticity to mass density)

**Vortensity** (physics) is the ratio of vorticity
to mass density. It is known as the **potential vorticity**.
Vorticity is a measure of local angular rotation in
a fluid flow, i.e., the **curl** of the flow's
**velocity field**.
*Vortensity* comes into play in
protoplanetary disk and disk/planet dynamics.

(*physics,fluid dynamics*)
**Further reading:**

http://en.wikipedia.org/wiki/Vorticity

http://en.wiktionary.org/wiki/vortensity

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