Question

26.Water meniscus in a graduated cylinder is of concave shape. While finding the volume, the correct reading will correspond to:

Answer 1

Lower meniscus

Explanation:

Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus. To correctly read a graduated cylinder, the surface at the center of the meniscus must be read, not the top of the ring of liquid clinging to the wall of the graduated cylinder. For most liquids, this center will be the lowest point of the meniscus. So the correct reading will correspond to the lower meniscus.