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

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

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Hydraulics and Fluid Mechanics in ME
Surface tension

Acts in the plane of the interface normal to any line in the surface
Is also known as capillarity
Decreases with fall in temperature
Is a function of the curvature of the interface

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