Pascal's principle defines that if the pressure is operated at any position in an incompressible liquid it is send undiminished to all other sections in the liquid.
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In the diagram the piston covers a fluid of density r and the atmospheric pressure over the piston is P0. Then force on piston at height 'h' below.
P = P0 + hrg .... (i)
Now if the outside pressure is increased by DP, then
P' = P0 + DP + rh g ....(ii)
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This defines that rising of pressure at top achieves undiminished everywhere.
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(i) Hydraulic press: 
This can be used to lift a heavy load placed on the platform of larger piston or to press the things placed between the piston and the heavy platform.
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(ii) Hydraulic Brake: Hydraulic brake system is used in auto-mobiles to retard the motion. The rule of hydraulic brake is similar as that of the hydraulic lift.
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