Liquid is needed to use hydraulics. It's what makes hydraulics work.
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Science of Hydraulics is the study of fluids, mostly liquids, in motion.
Hydraulics is the use of liquids to transmit power. Pneumatics is the use of gases (usually air) to transmit power.
One similarity is that they both use fluids. Both gasses and liquids are fluids. the two are also compressible.
hydraulic is liquid based, pneumatic is air.
Hydraulics..... or moving of the car super super simple.