Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

Above the centre of gravity
Could be above or below e.g. depending on density of body and liquid
Below be centre of gravity
At the centre of gravity

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

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