hydraulic fluid

a fluid, usually of low viscosity, as oil, used in a hydraulic system.


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The bending pumps hydraulic fluid through a motor, which generates electricity.
When a vehicle using the technology hits a small bump in the road, hydraulic
  fluid squirts into a turbine.
Ocean waves move the hydraulic fluid, which spins the generator.
Instead, the engine pressurizes the nitrogen tank, which pushes hydraulic fluid
  to drive the wheels.
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