Fluid Mechanics
A differential pressure cell is used for

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

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Fluid Mechanics
Vane anemometer

Is an area meter
None of these
Rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed
Is a variable head meter

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