<P> The 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 concave or convex, depending on the liquid and the surface . </P> <P> A concave meniscus occurs when the particles of the liquid are more strongly attracted to the container (adhesion) than to each other (cohesion), causing the liquid to climb the walls of the container . This occurs between water and glass . Water - based fluids like sap, honey, and milk also have a concave meniscus in glass or other wettable containers . </P>

What do you call the curved upper surface of water