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Consider a hydraulic machine such as a press. The pump in one of these machines might produce a pressure of, say, 500 pounds per square inch. Let's say that the pump pushes fluid through a tube with a cross-sectional area of one square inch so that the pump is producing a force of 500 pounds over one square inch. The fluid that it pumps might go into a cylinder with an area of say, 100 square inches where the fluid can push on a piston. Now each square inch of the piston undergoes a force of 500 pounds for a total force on the piston of 500 x 100 = 50,000 pounds. It is as if the force has been multiplied from the 500 that the pump produces to 50,000.

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