# data[].attributes.body
a system that uses water or another liquid under pressure to move something

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The study of pressure in liquids

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Chairs that go up and down use hydraulics

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Chairs that go up and down use hydraulics

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hydraulics = liquid

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pneumatics = air

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a system that uses air or another gas under pressure to move something

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The study of pressure in gases

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How Do Hydraulic Machines Work? | KiwiCo