where p is the pressure, ρ the density, V the velocity, and h the height in a gravitational field of strength g, all measured at the same point. This quantity is then constant throughout the fluid.
Using this relationship, which was formulated by Daniel Bernoulli, it is possible to measure the velocity of a fluid by measuring its pressure at two points, as with a manometer or a pitot tube.
Bernoulli's principle is used for, but not essential to, lift by airplanes. Another situation in which it applies is cavitation.
Related category AERODYNAMICS AND AERONAUTICS
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