hydraulics uses the principle of hydrostatic pressure to work
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There is no difference that I am aware of. These terms seem to be used interchangably.
Is a closed circuit hydraulic system.
hydraulic is liquid based, pneumatic is air.
A hydraulic pump uses an external mechanical force to pressurize the hydraulic fluid. A hydraulic motor uses the pressurized hydraulic fluid to apply a mechanical force an external machine. See the difference between a pump and a motor.
Pneumatic elevators work on air pressure (similar to a bank's drive through suction tubes) and hydraulic elevators work on oil/water pressure.