ascal's law states that pressure applied to a confined Incompressible fluid is transmitted equally in all direcnfined throughout the fluid. Hydraulic equipmally in all directions and brakes work on this principle. Here pressure is distributed evenly to raise the ram. A hydraulic press is a mechanical press that uses liquid pressure to generate force. It is a versatile tool that can be used for a variety of applications, including shaping metal, compressing materials, and testing materials. If pressure is applied to a movable output piston, it produces output force.