Bernoullis law

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Bernoulli's law For a steadily flowing fluid, the sum of the pressure, kinetic energy, and potential energy per unit volume is constant at any point in the fluid. Using this relationship, formulated by Daniel Bernoulli, it is possible to measure the velocity of a liquid by measuring its pressure at two points with a manometer that has two liquid columns or Pitot tube, actually two tubes that attach to a monometer.