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pneumatic system use air and air has its limitation of use mainly due to its high compressibility as gas.high power applications may compress air to such an extent leading to destruction of the system.whereas hydraulics also have compressibility which is at an unnoticed level even at high pressure.

I meant motors or generators that run on air released from a reservoir of compressed air.

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Q: Why there are not pneumatic engines above 100kw?
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