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Richardson number

(measure of fluid stability consisting of ratio of buoyancy and shear)

The Richardson number (Ri) is a dimensionless number offering a measure of a fluid's (e.g., atmosphere's) chances of the Kelvin-Helmholtz instability. It is a ratio of buoyancy (in terms of density and gravity) with shear, flow normal to the gravitational force.

The Richardson number is used in meteorology and oceanography and is applicable to some other situations when there is a chance of the fluids mixing.

(fluid dynamics,atmosphere)