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fluid power

power transmitted by the controlled circulation of pressurized fluid, usually a water-soluble oil or water-glycol mixture, to a motor that converts it into a mechanical output capable of doing work on a load. Hydraulic power systems have greater flexibility than mechanical and electrical systems and can produce more power than such systems of equal size. They also provide rapid and accurate responses to controls. As a result, hydraulic power systems are extensively used in modern aircraft, automobiles, heavy industrial machinery, and many kinds of machine tools.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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