To avoid parallax error when reading volumes, the eye should be at a level aligned with the liquid surface.

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (A)

Parallax error happens when your line of sight isn’t in the same horizontal plane as the liquid surface. If you look from the side or from above, the level can appear higher or lower than it really is, making the reading off. To prevent this, position your eye so you’re at the same level as the liquid surface (the meniscus) and read where the surface meets the scale. For most liquids, read at the bottom of the meniscus because that’s where the true level is when viewed head-on. This alignment eliminates angle-based distortion and gives an accurate volume.