Fluid Mechanics
Transition from laminar flow to turbulent flow is aided by the

All of these
Pressure gradient and the compressibility of the flowing medium
Surface roughness and curvature (i.e.sharp corners)
Vibration

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Fluid Mechanics
A differential pressure cell is used for

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

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