Volume percent is usually used when the solution is made by mixing two liquids.
One potentially confusing thing about volume percent stems from the fact that the volumes of liquids are not always additive. Sometimes the volumes change when two liquids are mixed together. For example, mixing 70 ml of isopropyl alcohol and 30 ml of water will not give you exactly 100 ml of solution.
E-mail instructor: Eden Francis
Clackamas Community College