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

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

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Hydraulics and Fluid Mechanics in ME
Meta-centric height is given as the distance between

The center of gravity of the body and the metacenter
Center of buoyancy and metacenter
The center of gravity of the body and the center of buoyancy
The center of gravity of the body and the center of pressure

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