Some regular water was put in the can and then heated. We would wait until almost all the water was boiled off so that there was just steam left in the can. Then the can is turn upside down and stuck into cold water. By sticking the can upside down we have prevented anything form entering the can (except water that will get sucked up from the bowl below). When the can hits the water the steam inside cools almost instantaneously. As it cool the steam condenses and contracts. This contraction creates a vacuum inside the can which want to suck up the water in the bowl. Because the vacuum is created so fast, water can not be sucked up fast enough and as a result the aluminum can itself experience a significant amount of stress on its structure due to the vacuum. The stresses on the can are too great and as a result the can is crushed.

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