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

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Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Loss of head and velocity of flow in both the pipes is same
Diameter of both the pipes is same
Loss of head and discharge of both the pipes is same
Length of both the pipes is same

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