The cavitation parameter is given by

[ p is the absolute pressure of the point of consideration, $p_{a}$ is atmosphere pressure, $p_{v}$ is vapour pressure of liquid, $ρ$ is the density of the liquid and V is the velocity]

- 1
  
  $\frac{p - p_{v}}{0.5 ρ V^{2}}$
- 2
  
  $\frac{p_{v} - p}{0.5 ρ V^{2}}$
- 3
  
  $\frac{p_{a} - p}{0.5 ρ V^{2}}$
- 4
  
  $\frac{p - p_{a}}{0.5 ρ V^{2}}$

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