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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.


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