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