Advanced Science Primary 4 Matter

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?

A Air takes up space.
B Air can be compressed.
C Air has no fixed shape.
D Air has mass.
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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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