The meniscus of water is concave as the forces of adhesion between water molecules and glass are stronger than forces of cohesion between water molecules.
What is a meniscus?
A meniscus is an upward or downward curve at the surface of a liquid. A meniscus can be classified as concave or convex.
- A concave meniscus curves downward. If one is looking down from the top, it curves away from the point of view, like the opening of a cave.
- In contrast, a convex meniscus curves upward; if one is looking down into the container, the meniscus curves towards us.