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# What is the Bernoulli Principle?

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The Bernoulli Principle is the concept that claims that as the velocity of a fluid increases, its pressure decreases. Daniel Bernoulli was an 18th century scientist who discovered this principle.

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The Bernoulli Principle applies to any fluid, even air. It is possible to see this occur very easily through a venturi tube, or one that is narrower at the middle than at the two ends. Passing a fluid through such a tube, it can be observed that it moves through the more narrow part faster. Since the molecules speed up, energy is used up and does not exert as much pressure. This is known as differential pressure, which means that the pressure at various points differs. That is why the Bernoulli Principle is also called Bernoulli's Law of Pressure Differential.

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## Related Questions

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The basic principle of hydraulics is put forth by Pascal's Law, which states that any pressure applied to a fluid is transmitted equally through the fluid, such as to the walls of the container. Hydraulic systems typically consist of a hydraulic fluid that transmits pressure applied at one point to other points in the system, a piston that initiates the pressure, a reservoir to contain the hydraulic fluid and a mechanism that fluid pressure actuates to perform work.

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Archimedes' principle states that any body completely or partially submerged in a fluid at rest experiences an upward, or buoyant, force equal to the weight of the fluid it displaces. This physical law of buoyancy was discovered by the ancient Greek mathematician Archimedes, supposedly while he was taking a bath.

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A circulating water pump works just as any centrifugal pump works: by turning an impeller to increase the velocity of a fluid as it passes over the impeller vanes. The high-velocity water is turned into high-pressure water when going through the diffusion part of the casing. The most common casing design is the vertical in-line type.