Which statements best describe measuring with a graduated cylinder? all that apply.
a. the liquid in the cylinder normally forms a concave meniscus.
b. the liquid in the cylinder normally forms a convex meniscus.
c. measurement is taken at the bottom of the meniscus.
d. measurement is taken at the top of the meniscus.
e. a graduated cylinder can be used to measure the volume of an irregular solid.
f. a graduated cylinder can be used to measure the volume of a regular solid.

A graduated cylinder also known as measuring cylinder is commonly used in laboratories to measure the volume of liquids. When a liquid is poured into the cylinder it forms a concave meniscus. The reading is measured by observing the value at the lower end of the meniscus. Graduated cylinder can only be used for liquids. 

Graduated cylinder can also be used to find the volume of a solid through a method known as water displacement. When a solid is immersed in the water, the water level rises. The volume of the solid is equal to the change in the level of water.

Therefore, the correct statements are:
a.The liquid in the cylinder normally forms a concave meniscus. 
c.Measurement is taken at the bottom of the meniscus.
e.A graduated cylinder can be used to measure the volume of an irregular solid.

For you to be sure whether it is high pressure in the breathing system or to confirm the percentage of air which is taken in and out by the patient