We went down to the field with a solar bag. We ran around with it and filled the bag with air. When the sun heated it up it rose up into the air.
This happened because when the sun heats up the air it gets less dense. This means it's lighter and so it floats on the colder air.
We saw that when the sun went in, the bag came back down to earth. This is because the air cooled and became less dense.
Next time we'll try an air balloon and see what happens.
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