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Originally Posted by pras870
It's easy to get mistaken, the only difference between the 2 is that hydraulics is powered by a fluid of some time (water or sometimes an oil of some sort) while pneumatics is powered by air.
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BIG difference!
Air is compressable, hydraulic fluids are not (usually oil, rarely water)! That means that pneumatic systems can store energy relatively easily in a tank, but are not very accurately positionable under changing loads. Hydraulic systems are a lot heavier, and all energy has to be provided by the pump at the time when its needed (unless a pneumatic tank stores energy - in which case you could use pneumatics right away).
For the uneducated admirer of the bot, though, they are just the same
LOL