The greater the water depth ( or pressure for a water pipe ) at which the fluid acceleration occurs, the lesser the tendency for cavitation because of the greater difference between local pressure and vapour pressure . ( The non-dimensional cavitation number is a measure of the tendency for vapour pressure bubbles to form in a liquid, calculated as the difference between local pressure and vapour pressure, divided by dynamic pressure . ) Once the flow slows down again, the water vapour will generally be reabsorbed into the liquid water.
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