Fluid Mechanics
Pressure gradient in the pipe flow is influenced by the

Density & viscosity of the fluid
All of these
Velocity of the fluid
Diameter of pipe

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Fluid Mechanics
A differential pressure cell is used for

Measuring the difference of the impact & the static pressure
Measuring small pressure difference in liquids
Remote recording of pressure difference
Measuring small pressure difference in gases

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Fluid Mechanics
The Prandtl mixing length is

Zero at the pipe wall and is a universal constant
Independent of radial distance from the pipe axis
Useful for computing laminar flow problems
Independent of the shear stress

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