Question

What does hydraulic mean?

Answer 1

1.
denoting, relating to, or operated by a liquid moving in a confined space under pressure.
"hydraulic fluid"
2.
relating to the science of hydraulics.
"hydraulic analysis of streams"

Answer 2

Hydraulics is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concerns gases.

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