The following statement about the meniscus is correct: The reading should be taken at the lower portion for most liquids.

The following statement about the meniscus is correct: The reading should be taken at the lower portion for most liquids.

• A. The reading should be taken at the highest point
• B. The reading should be taken at the middle
• C. The reading should be taken at the lower portion for most liquids
• D. The reading should be taken at the bottom of the cylinder

Answer: (C)

When measuring liquid volume in a graduated cylinder, you read the bottom of the curved surface, the meniscus. For most liquids, adhesion to the glass and cohesive forces within the liquid create a concave meniscus, so the lowest point sits in the middle. Reading at that lowest point gives the true volume. Reading at the top or middle would misread the amount. Remember to view at eye level to avoid parallax. (Exceptions exist: liquids like mercury form a convex meniscus, where the top would be read.)

When measuring liquid volume in a graduated cylinder, you read the bottom of the curved surface, the meniscus. For most liquids, adhesion to the glass and cohesive forces within the liquid create a concave meniscus, so the lowest point sits in the middle. Reading at that lowest point gives the true volume. Reading at the top or middle would misread the amount. Remember to view at eye level to avoid parallax. (Exceptions exist: liquids like mercury form a convex meniscus, where the top would be read.)