Hydraulics and Fluid Mechanics in ME
Mach number is significant in

supersonics, as with projectiles and jet propulsion
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
all of fhe above
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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Hydraulics and Fluid Mechanics in ME
Venturimeter is used to

Measure the pressure difference of liquid flowing between two points in a pipe line
Measure the pressure of a flowing liquid
Measure the velocity of a flowing liquid
Measure the discharge of liquid flowing in a pipe

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