Fluid Mechanics
A differential pressure cell is used for

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

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Fluid Mechanics
The Prandtl mixing length is

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

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