Zero

The ratio of vorticity to mass density.

The vorticity vector is DelxV = v/r sin(RV)H1, the Curl of the vector V. The unit vector H1, is perpendicular to the plane formed by the radius vector R and and the vector V.

Speed, direction, average temperature, steadiness of direction, vorticity.

J. W. Naughton has written:

'Experiments on the enhancement of compressible mixing via streamwise vorticity. Part l - Optical measurements' -- subject(s): Vorticity, Turbulent mixing