* a) Working fluid: Pneumatics use air, Hydraulics use Oil

* b) Power: Pneumatic power less than hydraulic power

* c) Size: P components are smaller than H components

* d) Leakage: Leaks in hydraulics cause fluid to be sticking around the components. In pneumatics, air is leaked into the atmosphere.

* e) Pneumatics obtain power from an air compressor while hydraulics require a pump

* f) Air is compressible, hydraulic oil is not