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In this activity, students investigate how condensation causes moisture to form on the outside of a cold cup. To see if the condensed water vapor comes from the air, students use 2 cold cups, but limit the air around one of them by placing it in a plastic bag. Students then compare the amount of moisture that forms on the outside of both cups. They will see that more moisture forms on the exposed cup. Since students determined in the previous activity that water vapor can condense to form liquid water, they can conclude that water vapor from the air must condense to form the moisture on the outside of a cold cup.
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