When reading the volume of a liquid against a graduation mark, hold the device at eye level and read the mark?

The correct approach when measuring the volume of a liquid in a graduated cylinder or similar device is to read the mark at the bottom of the meniscus. The meniscus is the curved surface of the liquid formed due to surface tension, and it can appear differently based on the type of liquid and container. By reading at the bottom of the meniscus, you ensure the most accurate measurement since this point is generally the true volume line for the liquid.

Holding the device at eye level is crucial to avoid parallax errors, which can occur if your line of sight is too high or low compared to the meniscus. Reading at different points of the meniscus would yield inaccurate measurements—such as reading in the middle or on top—because these points do not represent the actual volume of liquid present. Understanding how to properly read the meniscus is essential for accurate liquid measurement in pharmacy practice, where precise dosages are critical.