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1. Define hydraulic. Operated by the pressure of water or other liquids. 2. Define pneumatic. Run by using compressed air. 3. Examples of hydraulic devices are pumps, turbines, jaws of life, and bobcat tractors. 4. Examples of pneumatic devices are impact wrenches, air grinders, car jacks, and dentist drills. 5. Hydraulic systems use liquids for power. 6. Pneumatic systems are run by compressed air. 7. Hydraulic systems use the pressure of water, and pneumatic systems use compressed air. []