14The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface
of a liquid close to the surface of the container or another object, caused by surface tension. It
can be either convex or concave.
A convex meniscus occurs when the molecules have a stronger attraction to each other
(cohesion) than to the material of the container (adhesion). This may be seen between mercury
and glass in barometers and thermometers.
Conversely, a concave meniscus occurs when the molecules of the liquid attract those of the
container's, causing the surface of the liquid to cave downwards. This can be seen in a glass of
water.