noun (used with a singular verb)
the branch of hydrodynamics that deals with the statics of fluids, usually confined to the equilibrium and pressure of liquids.

1650–60; see hydrostatic, -ics

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World English Dictionary
hydrostatics (ˌhaɪdrəʊˈstætɪks)
(functioning as singular) See also hydrodynamics the branch of science concerned with the mechanical properties and behaviour of fluids that are not in motion

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American Heritage
Science Dictionary
hydrostatics   (hī'drə-stāt'ĭks)  Pronunciation Key 
The scientific study of fluids, especially noncompressible liquids, in equilibrium with their surroundings and hence at rest. Hydrostatics has many applications in biology and engineering, as in the design of dams. Compare hydrodynamics.
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