What is difference between hydrualic and hydrostatic?

Question

What is difference between hydrualic and hydrostatic?

Answer 1

Hydraulic equipment utilizes oil under high pressurefor operating cylinders in lifting heavy load such as cars in a wash rack, while hydraulic uses pressurized water only for testing leaks in pressurized vessels or piping system.

Answer 2

*Hydrualic is a 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.

*In this sense, hydrostatic means that energy transfer is brought about by fluid flow and pressure, but not from the kinetic energy of the flow (the latter would be characteristic of a hydrodynamic drive, such as a fluid coupling or torque converter).

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