Sam and Kris made a little movie for their science project.
For the first part, they have made a dry ice bubble in a bowl. The dry ice, or frozen carbon dioxide (C02), is denser than the air we breathe so the bubble eventually plops down.
For the second part, they have a simple dry ice bomb. They just put dry ice and water into the bottle and threw it into the yard, and a shard of the bottle actually hit the window on the second floor!
For the third part, they constructed a cannon, firing a tennis ball over about 200 ft. With just the bomb from the second part and a tennis ball.
Music: "Chop Suey" By System of a Down.
by Sam and Kris