Hydraulics and Fluid Mechanics in ME
Alcohol is used in manometers because

It has low vapour pressure
It has low surface tension
It is clearly visible
It can provide longer column due to low density

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Hydraulics and Fluid Mechanics in ME
Reynolds number is significant in

simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
All of these
supersonics, as with projectile and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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