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Pascal's law states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid.

Pressure= Force divided by Area, that is Force = pressure*Area, as pressure remains constant as per Pascal's Law, if area increases force increases .

So if we applied small force on a piston of small radius anywhere in a confined incompressible liquid, we will get large force on a piston of larger radius.

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Q: How does a hydraulic system achieve a increase in force?
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