What are the controlling parameters which dtermine if a
meniscus is convex or concave?
It depends on the interaction between the liquid and the material making up
the tube containing the liquid. If the two attract each other, the wall of
the tube will be "wetted" and the liquid will climb up the wall. Hence, a
concave meniscus. If the liquid and tube repel each other, the liquid will
avoid touching the wall, and the meniscus will be convex.
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
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Update: June 2012