Fluid Mechanics
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

Q/4
Q/16
Q/2
Q/8

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Fluid Mechanics
A differential pressure cell is used for

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

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