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Hydraulic Devices

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Hydraulics refers to the use of liquids (such as oil or water) to accomplish certain tasks. An example of a hydraulic device is a hydraulic jack that you see in many auto shops.
Pneumatics refers to the use of compressed air to accomplish tasks. An example of a pneumatic device would be an air powered jack hammer.
If you would like to experiment with hydraulic devices then I suggest that you visit http://www.teachergeek.com at http://www.teachergeek.com/Products-Hydraulics_Pneumatics.html. Teacher Geek sells a kit that demonstrates hydraulic principles using syringes and hoses to construct a hydraulic arm. Click on the thumbnails below for pictures of the hydraulic arm.
Video: Teacher Geek Hydraulic arm in action

Teacher Geek also sells a "racer" that can be constructed using hydraulics and you can also buy syringe and hoses in a bulk kit to experiment with on your own.