Hydraulics and Fluid Mechanics in ME
A hydraulic press is a device used

All of these
To store pressure energy which may be supplied to a machine later on
To lift larger load by the application of a comparatively much smaller force
To increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure

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

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