The water in the can was heated until it reached its boiling point. At the boiling point, the liquid water evaporated and steam was visible. What happened to the air in the can when the water boiled? Explain. As the mouth of the can was dipped into the cold water, the water vapor inside the can cooled and condensed. How does this impact the pressure inside the can? How does this compare to the pressure outside the can? You may use a picture or diagram to help explain your answer.

Why was the temperature gradient important? In other words, why was it important to have a very hot can of water and a very cold water bath?