Invisible Fire Extinguisher by Bryce Hixson
This is a very entertaining two-part lab. In the first experiment, you will observe two of the physical characteristics of carbon dioxide gas: color and density. You will also demonstrate that it is not flammable by extinguishing the flame of a candle. Then you can supersize the experiment using a 10-gallon aquarium to illustrate the principles of flammability, sublimation, and density.