Michael weighed an empty football. He then pumped air into it and weighed it again. The mass increased by 5g. What does this experiment prove?
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Worked Solution
Step 1: Mass is a measure of the amount of matter in an object.
Step 2: Adding more air increased the total mass shown on the scale.
Step 3: This proves that air, even though invisible, has mass.
Correct answer: Air has mass.
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