Fluid Mechanics
A differential pressure cell is used for

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

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Fluid Mechanics
Vane anemometer

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

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