The water in the can boiled because of the increase in heat. The aluminum can also heat up along with the water inside it, because aluminum is a conductor of heat. During the experiment the water took a while to boil. This is because the atoms took some time to start moving faster. Once the water vapor was coming out of the can we could tell it was boiling. So, when we put the can with the water inside it into ice water, the can collapsed. This is because the bouncing atoms hit instant cool. When the hot can suddenly hit ice cold water it collapsed. This is also because of air pressure. When the water was heated, the air pressure in the can was less than the air pressure outside the can, causing it to be unbalanced. The air pressure on the outside was pushing on the can. So when the molecules hit cold water they escaped from the can into the water. The air pressure outside the can pushed with a sudden force causing the can to collapse.
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