Question

The direction of the excess pressure in the meniscus of a liquid of angle of contact $2\pi /3$ is:

• A. Upward
• B. Downward
• C. Horizontal
• D. Cannot determined

Answer 1

The correct option is A Upward

Excess pressure is always on the concave side of the surface. For angle of contact of $2\pi /3$, the liquid should have a convex surface. So, the excess pressure should be in the upward direction.