Reading the Meniscus in a Measuring Cylinder

Steps:

• Observe the bottom of the curved meniscus at eye level for accurate reading.
• Identify the scale marks: assume marks at 20, 25, and 30 cm³.
• Note the liquid level aligns between 20 and 25 cm³, specifically at the 24 cm³ position.
• Record the volume as 24 cm³ based on the estimated position.

Why B is correct:

• The volume is read from the lowest point of the meniscus, which falls precisely at the 24 cm³ graduation per standard laboratory measurement protocol.

Why the others are wrong:

• A underestimates by ignoring the level above 20 cm³.
• C overestimates by rounding up from the actual 24 cm³ mark.
• D significantly overestimates, as the level is well below 30 cm³.

Final answer: B