1. Can Crusher 1.Can crushed 2.Water inside the can was heated creating gas. The gas particles expanded inside the can. When Mr. Lenet put the can in the water, the gas rapidly condensed or turned back into a liquid which created less pressure in the can. The outside pressure crushed the can. Hot Plate Outside Air Pressure Inside Air Pressure Outside Air Pressure

2. Popcorn 3. Water inside the kernel becomes steam, it expands. The pressure inside the kernel increases. The pressure outside is unchanged, so the pressure inside forces the kernel to expand. 4. The can would be crushed more quickly because the ice water made the steam condense more quickly. KernelPopcorn Water Steam Outside Air Pressure

3. More Can Crusher Examples Can Crusher http://www.youtube.com/watch?v=vcsxB5dKJMg 55 Gallon Steel Drum http://www.youtube.com/watch?v=Bi6sDTXE9TE