In this Activity, students test whether cans of carbonated beverages sink or float in water and then determine whether caffeine content, soda color, or sugar content in the carbonated sodas is responsible for the buoyancy of the sealed cans. This Activity can be used as an introduction to density in a middle school physical science course, or a high school chemistry or physics course. It can also be used in elementary or middle school courses as an experiment in controlling variables and making meaningful comparisons.
Michael J. Sanger, J. Chem. Educ. 2006, 83, p1632A.