P602: Simple demonstration illustrating the law of conservation of mass

Author: William C. Deese, Louisiana State University, USA


Date: 8/5/14

Time: 3:05 PM3:25 PM

Room: MAK BLL 126

Related Symposium: S47

In the demonstration a balloon containing about 20 grams of baking soda will be attached to a bottle that has about 200 ml of vinegar. The bottle, balloon and contents will be massed on an electronic balance. The balloon will be lifted to allow the baking soda to fall into the vinegar. Production of carbon dioxide gas will inflate the balloon. Recalling the Law of Conservation of Mass, the audience is asked to discuss with their neighbors if the mass reading of the bottle, balloon and contents will now be equal to, greater than, or less than the first determination. The mass will be measured a second time and the results will be discussed.