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A device for moving liquids by adding to the pressure existing within them. For example, a centrifugal pump first increases the velocity of the fluid by the use of impellers; this velocity increase is then converted to an increase in pressure by the use of appropriately orientated guide vanes or the use of a volute casing. Other pump types include multistage turbine pumps, jet pumps, positive-displacement pumps, and suction lifts.

Subjects: Earth Sciences and Geography.

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