Standard Science Primary 4 Matter

A basketball was weighed before and after more air was pumped into it. The mass of the basketball increased. What does this experiment prove?

A Air can be compressed.
B Air occupies space.
C Air has mass.
D Air has a definite volume.
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Worked Solution

Step 1: Pumping air into the ball adds more matter. Step 2: The increase in the total weight/mass on the scale shows the added air contributed to the mass. Step 3: This proves air has mass.

Correct answer: Air has mass.

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