Opposite of Meniscus

name         Andrea
status       other
grade        other
location     MI

Question -   What is the opposite of meniscus?
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Hi Andrea
There are not an opposite of meniscus.
Probably you are referring to concave/convex
meniscus comparison.
See a meniscus is formed when a liquid meets a solid
object, causing the surface of the liquid to bend due
to cohesion / adhesion forces and surface tension.
Usually this happens with a liquid in a narrow tube.
If the liquid is higher at the edges than in the
middle (it adheres to the tube) the meniscus is concave, like
the water. In other cases, like mercury liquid it
sticks to itself more strongly forming a convex
meniscus, where the liquid is higher at the center.

Thanks for asking NEWTON!
Mabel
(Dr. Mabel M. Rodrigues)
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A meniscus is usually concave (upward) because the surface tension 
of the fluid is less than that of the walls of the tube, and the 
liquid wets the surface of the tube and tends to "crawl up" the 
tube. That is what is usually seen in aqueous solutions. In the case 
of high surface tension liquids, mercury for example, the high 
surface tension of the liquid metal tends to make the liquid attract 
it to itself. The result is a meniscus that is convex (upward). The 
size of the tube and the surface tension of the liquid versus the 
surface of the tube affects the curvature of the meniscus. A side 
note: I have seen very pure (99.9999% mercury) in a rigorously 
flamed quartz container (This drives off all the adhered water and 
gases.) in which the meniscus is flat, at least so far as the naked 
eye can detect. Both surfaces then have high surface tensions.

Vince Calder
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