La hidráulica es la rama de la física que estudia el comportamiento de los fluidos en función de sus propiedades específicas. Es decir, estudia las propiedades mecánicas de los líquidos dependiendo de las fuerzas a las que son sometidos. Todo esto depende de las fuerzas que se interponen con la masa y a las condiciones a las que esté sometido el fluido, relacionadas con la viscosidad de este.

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Hydraulics (From Greek: Υδραυλική) is a topic in applied science and engineering dealing with the mechanical properties of liquids or fluids. At a very basic level, hydraulics is the liquid version of pneumatics. Fluid mechanics provides the theoretical foundation for hydraulics, which focuses on the engineering uses of fluid properties. In fluid power, hydraulics are used for the generation, control, and transmission of power by the use of pressurized liquids. Hydraulic topics range through some part of science and most of engineering modules, and cover concepts such as pipe flow, dam design, fluidics and fluid control circuitry, pumps, turbines, hydropower, computational fluid dynamics, flow measurement, river channel behaviour and erosion. Free surface hydraulics is the branch of hydraulics dealing with free surface flow, such as occurring in rivers, canals, lakes, estuaries and seas. Its sub-field open channel flow studies the flow in open channels. The word "hydraulics" originates from the Greek word ὑδραυλικός (hydraulikos) which in turn originates from ὕδωρ (hydor, Greek for water) and αὐλός (aulos, meaning pipe).

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