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Water cycle in a bag

In this video, Karen creates a model of the water cycle in a freezer bag.

She first draws a simple diagram of the water cycle on the outside of the bag. Then some water is added to the bottom of the bag with a little blue food colouring so that it can be seen. When the bag is stuck onto a sunny window, the water evaporates, and then condenses higher up, and drips back down again, modelling the water cycle.

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In the comments below explain what is happening inside the bag after it has been heated. What misconceptions might this activity address?

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This video is from the free online course:

Teaching Primary Science: Chemistry

National STEM Learning Centre