Investigation Question 2:
How can you tell air is "something?"

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8.

Ask your students to find another way to show that air is in the cup (They will find that it can be released by upending the cup and the air can be seen as it bubbles to the surface. Your students can also experiment with transferring the air from one cup to another underwater.)

9.

Have your students draw pictures showing the different ways the cup was lowered into the water. They can circle the picture of the method that kept the cotton balls from getting wet. (Alternatively, you could use the diagram below as a blackline master.)

10.

Have them consider the cup with the hole in it. What would happen if the whole had been in a different place in the inverted cup?