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There is a theory called Bernoulli's Theorem which states that:

p+dv2/2 +dgh=constant, where p stands for pressure d for density of the fluid g the acceleration due to gravity h the height of th liquid from the base level and v the speed of the liquid. If the pressure throughout the liquid remains constant then the velocity also remains constant. On changing the pressure the velocity also changes to keep the equation value constant.

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