Ca: Cavitation Number
d: density ( water density = 1000kg/m³)
v: Velocity
P: Pressure
Pv: Vapor Pressure

Ca	= (	P	-	Pv	) / (	d	·	v ²	) / 2
		at atm bar inH2O inHg kp/cm² kPa lbf/ft² lbf/in² mbar mca mce mH2O mmca mmce mmH2O mmHg mmWC mmWs MPa mWC mWs N/mm² Pa PSI torr		at atm bar inH2O inHg kp/cm² kPa lbf/ft² lbf/in² mbar mca mce mH2O mmca mmce mmH2O mmHg mmWC mmWs MPa mWC mWs N/mm² Pa PSI torr		g/cm³ g/l g/m³ g/ml g/mm³ kg/cm³ kg/l kg/m³ lb/ft³ lb/in³ lb/gal (UK) lb/gal (US) mg/cm³ mg/l mg/m³ oz (Av)/gal (UK) oz (Av)/gal (US) oz (Av)/ft³ oz (Av)/in³ t/m³		cm/min cm/s ft/h ft/min ft/s fph fps in/s ips km/h km/min km/s m/h m/min m/s mi/s mi/min mph mps nmi/h yd/h yd/min yd/s