Hydraulics and Fluid Mechanics in ME
Buoyant force is

The resultant force on a body due to the fluid surrounding it
The resultant force acting on a floating body
The force necessary to maintain equilibrium of a submerged body
Equal to the volume of liquid displaced

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
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

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