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

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

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Hydraulics and Fluid Mechanics in ME
Surface tension

Is also known as capillarity
Is a function of the curvature of the interface
Acts in the plane of the interface normal to any line in the surface
Decreases with fall in temperature

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