Need help with hydraulic arm (10 points)?
im making a hydraulic arm (backhoe type thing) for science class at school, and im using 4 syringes and some tubing stuff, i was wondering what would be better, filling the cylinders with water or just leaaving it with air… it will be lifting light stuff nothing heavy. but which one would be more powerfull air or water.
Thanks 
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Water will produce better results but will require more effort. Reasoning: Air as a gas abides to gas laws and will compress under pressure, rather than do anything (unless your syringes are really lubricated). Using water it will not compress as much but you will need to do this manually – it would be tricky to do a good hydrolic arm. The biggest problem i can forsee is that your tubing does not get a good enough seal on the syringe and it will leak.
Good luck