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Sep 22,  · Daniel Bernoulli first proposed in “In water or air currents, if the velocity is low, the pressure is high. If the velocity is high, the pressure is small”. We call it “Bernoulli’s Principle”. This is the basic principle of hydraulics before the continuum theory equation of fluid mechanics is established.

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Pressure altitude is an important value for calculating performance as it more accurately represents the air content at a particular level. Formula to calculate pressure altitude. Example: Suppose the current altimeter reading is 20, calculate the pressure altitude if the field elevation is feet. Therefore, your pressure altitude is 10,