Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant speed and capacity, the pressure and power vary

Inversely as density
Inversely as square root of density
As square of density
Directly as the air or gas density

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Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Area of jet at vena-contracta to the area of orifice
Actual velocity of jet at vena-contracta to the theoretical velocity
Actual discharge through an orifice to the theoretical discharge

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