In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes
less than atmospheric pressure.
more than liquid vapor pressure.
less than liquid vapor pressure.
more than atmospheric pressure.
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Phosphoric acid is produced in wet process from phosphate rock and
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be
Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium