When reading a meniscus in a graduated cylinder, where should you take the reading?

• A. The top of the meniscus
• B. The middle of the meniscus
• C. The bottom of the meniscus
• D. Any point on the meniscus

Answer: (C)

When measuring the volume of liquid in a graduated cylinder, the correct practice is to read the bottom of the meniscus. The meniscus is the curved surface of the liquid, which forms due to surface tension. The lowest point of this curve corresponds to the accurate measurement of the liquid's volume.

Taking the reading from the bottom of the meniscus ensures that the measurement reflects the true level of the liquid. If the reading is taken from the top or any arbitrary point of the meniscus, it could lead to inaccuracies because the curve's shape can misrepresent the actual volume. Therefore, always ensure that your eye is level with the bottom of the meniscus for precise measurement.