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Pascal’s Law

Pascal’s law states that if gravity effect is neglected, the pressure at every point of liquid in equilibrium of rest is same.
The increase in pressure at one point of the enclosed liquid in equilibrium of rest is transmitted equally to all other points of the liquid and also to the walls of the container, provided the effect of gravity is neglected.

Working of hydraulic lift

It is used to lift heavy loads. If a small force f is applied on piston of C, as shown in Fig. 4, then the pressure exerted on the liquid will be
Fig. 4
P = f/a [a = area of cross section of the piston in C]
This pressure is transmitted equally to piston of cylinder D. Hence, the upward force acting on piston of cylinder D,
As A >> a, therefore, F >> f. So heavy load placed on the larger piston is easily lifted upwards by applying a small force.

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