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It means denoting or relating to a liquid moving in a confined space under pressure.
A hydraulic drive system is a quasi-hydrostatic drive or transmission system that uses pressurized hydraulic fluid to power hydraulicmachinery.
In hydraulics-based systems, mechanical movement is produced by contained, pumped liquid, typically through cylinders moving pistons. ... Simple hydraulic systems include aqueducts and irrigation systems that deliver water, using gravity to create water pressure.
Hydraulics (from Greek: Υδραυλική) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties