Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

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

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The size of orifice is large
The available head of liquid is less than 5 times the height of orifice
The available head of liquid is more than 5 times the height of orifice
The velocity of flow is large

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