Hydraulics and Fluid Mechanics in ME
The kinematic viscosity is the

Product of absolute viscosity and density of the liquid
Product of absolute viscosity and mass of the liquid
Ratio of absolute viscosity to the density of the liquid
Ratio of density of the liquid to the absolute viscosity

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Hydraulics and Fluid Mechanics in ME
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

ratio of inertial force to force due to gravitation
ratio of inertial force to force due to viscosity
ratio of inertial force to force due to surface tension
all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

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