Using the pressure of a liquid, usually oil or water, to move or control something like a machine or brake.
From Greek “hydraulikos,” meaning “water organ” or “worked by water,” from “hydor” (water) and “aulos” (pipe). It first described water-powered devices and later any fluid-based power systems.
Hydraulic systems work because liquids are nearly impossible to squeeze, so pushing in one place pushes everywhere. That’s how a light press on a brake pedal can stop a whole car hurtling down the road.
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