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Medical Definition of pneumatics. : a branch of mechanics that deals with the mechanical properties of gases.
The main difference (i would consider) is the medium used to transmit power. In Hydraulics liquid/oil is used to transmit power, whereas in pneumatic compressed gas (generally air) is used to transmit power. Due to this difference there are many things that differ between the systems. For example you would need a tank to store oil from which the system can draw oil in case of deficit. In pneumatic the system can just draw air from the atmosphere and just a filter would be required to purify it.