Fluid Mechanics
Path followed by water jet issuing from the bottom of a water tank will be a

Zig-zag path (which is geometrically undefined)
Hyperbola
Horizontal straight line
Parabola (vertex being at the opening)

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Fluid Mechanics
A differential pressure cell is used for

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

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