Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

semi-log plot of friction factor against Reynolds number
log-log plot of relative roughness against Reynolds number
log-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness

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Hydraulics and Fluid Mechanics in ME
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

It is easier to see through the glass tube
All of these
Glass tube is cheaper than a metallic tube
It is not possible to conduct this experiment with any other tube

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