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 surface tension
ratio of inertial force to force due to gravitation
ratio of inertial force to force due to viscosity

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Hydraulics and Fluid Mechanics in ME
If a vessel containing liquid moves downward with a constant acceleration equal to ā€˜g’ then

None of these
there will be vacuum in the liquid
the pressure throughout the liquid mass is atmospheric
the pressure in the liquid mass is greater than hydrostatic pressure

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