Hydraulics and Fluid Mechanics in ME
Capillary action is due to the

Cohesion of the liquid
Surface tension
Adhesion of the liquid molecules and the molecules on the surface of a solid
All of the listed here

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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
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
supersonics, as with projectiles and jet propulsion

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