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A measure of cavitation is the cavitation number
where Po is the absolute pressure Pv is the vapor pressure the denominator is the dynamic
pressure head.
Think of Bernoulli's principle...pressure at place A = pressure at place B + the dynamic head at B. If the dynamic head at B is greater than zero, then the pressure at place B is lower than the pressure at place A.
In the case of aircraft at altitude, the drop in pressure would cause separation of gas from liquid introducing bubbles of gas into the hydraulic system.
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Updated: February 23, 1999