Fluid Mechanics
The normal stress is the same in all directions at a point in a fluid, when the fluid is

Incompressible
Non-viscous
Having no motion of one fluid layer relative to the other
Both A and B

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Fluid Mechanics
A differential pressure cell is used for

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

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