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hydraulics

hydraulics, branch of engineering concerned mainly with moving liquids. The term is applied commonly to the study of the mechanical properties of water, other liquids, and even gases when the effects of compressibility are small. Hydraulics can be divided into two areas, hydrostatics and hydrokinetics. Hydrostatics, the consideration of liquids at rest, involves problems of buoyancy and flotation, pressure on dams and submerged devices, and hydraulic presses. The relative incompressibility of liquids is one of its basic principles. Hydrodynamics, the study of liquids in motion, is concerned with such matters as friction and turbulence generated in pipes by flowing liquids, the flow of water over weirs and through nozzles, and the use of hydraulic pressure in machinery.

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hydraulics

hydraulics Physical science and technology of the behaviour of fluids in both static and dynamic states. In 1795, Joseph Bramah invented the hydraulic press. In the 19th century, hydraulic power was used for cranes and swing-bridges. Oil later replaced water as the main working fluid. Most modern cars have hydraulic brakes. See also fluid mechanics

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hydraulics

hy·drau·lics / hīˈdrôliks/ • pl. n. 1. [usu. treated as sing.] the branch of science and technology concerned with the conveyance of liquids through pipes and channels, esp. as a source of mechanical force or control. 2. hydraulic systems, mechanisms, or forces.

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