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The basic principle of a hydraulic system is very simple: the transfer of a force acting on one point to another through an uncompressible liquid. An oil is usually used as a liquid medium. In this process, the force generally increases.
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Suppose two suitable pistons were placed in two cylinders filled with oil connected by an oil pipe. If one of the pistons were pressed down, the pressure would pass through the oil in the pipe to the second piston.
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