Question Detail
Question
What is the shape of the meniscus for a liquid with a contact angle greater than 90°, such as mercury in a glass container?
Correct Answer
Option B is the correct answer.
Detailed Explanation
When the contact angle is greater than 90°, the liquid does not wet the surface and is pulled inward by its cohesive forces. This results in a meniscus that is curved upward in the center, which is a convex meniscus.
Hint
Visualize mercury in a glass tube. The surface curves downward at the edges and upward in the middle.