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Hydrolic lift

Hydraulic Lift

It is used to lift heavy objects. It is an application of Pascal's law. It consists of two cylindrical vessels P and Q fitted with frictionless movable piston of area ? and A respectively. The vessels are connected by a tube containing liquid . Suppose a force ƒ is applied on the smaller piston, then the pressure exerted on liquid

According to Pascal's law, the same pressure P is transmitted to the larger piston. Therefore, force on larger piston is

Thus, a small force appears as a very large force on the larger piston which is able to lift heavy objects.