Frozen carbon dioxide is also called "dry ice" because it is very very cold. How could you use dry ice to make bubbles stay floating in mid-air? "Think about densities -- What's more dense, cold air or warm air? Watch this movie to find out!
This movie is in Quick Time format. If you need a plug-in to view it, you can get it here.
© 2002 Everyday Science, Poudre School District, Colorado State University