Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

Which term describes the curved surface formed by a liquid in a container?

1. Super saturated solution

2. Type of "rough" balance

3. Curved surface formed by a liquid in a container

4. Magnet used for mixing solutions

The correct answer is: Curved surface formed by a liquid in a container

The term that describes the curved surface formed by a liquid in a container is commonly referred to as the meniscus. This phenomenon occurs due to surface tension and the adhesive forces between the liquid and the walls of the container. In a typical situation, when a liquid is poured into a container, the molecules at the surface are attracted to the container's walls, causing the liquid to curve up slightly along the edges, forming this characteristic shape. The meniscus can be concave or convex, depending on the properties of the liquid and the type of container. For instance, in a graduated cylinder filled with water, the meniscus will curve downwards due to the adhesive forces of water molecules to the glass. On the other hand, liquids that do not adhere well to the container, like mercury in a glass beaker, will produce a convex meniscus. Understanding the meniscus is crucial for accurately measuring liquid volumes, as readings are typically taken from the lowest point of the curve for concave surfaces or the highest point for convex surfaces. Knowing how to interpret the meniscus can significantly affect experimental accuracy and data interpretation in laboratory settings.