In the context of measuring liquid volume in a graduated cylinder, what is the name of the curved surface formed at the top of the liquid?

• A. Crest
• B. Meniscus
• C. Apex
• D. Vertex

Answer: (B)

Verified step by step guidance

1. Understand that when measuring liquid volume in a graduated cylinder, the surface of the liquid is not flat but curved due to surface tension and adhesion between the liquid and the container walls.
2. Recognize that this curved surface is called the 'meniscus'. It can be concave or convex depending on the liquid and the container material.
3. For most liquids like water in glass, the meniscus is concave, meaning it curves downward, and you read the volume at the bottom of the meniscus.
4. For liquids like mercury, the meniscus is convex, curving upward, and you read the volume at the top of the meniscus.
5. Therefore, the correct term for the curved surface at the top of the liquid in a graduated cylinder is the 'meniscus'.