Hydraulics and Fluid Mechanics in ME
The total energy of a liquid particle in motion is equal to

Kinetic energy - (pressure energy + potential energy)
Potential energy - (pressure energy + kinetic energy
Pressure energy - (kinetic energy + potential energy)
Pressure energy + kinetic energy + potential energy

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

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
supersonics, as with projectiles and jet propulsion

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