Advanced Science Primary 4 Matter

Ravi used a pump to add more air into a basketball that was already full. He noticed that the size of the ball remained the same, but its mass increased. What does this show?

A Air has mass.
B Air has no definite volume.
C Both (2) and (3)
D Air can be compressed.
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Worked Solution

Step 1: Adding air increased mass (Air has mass). Step 2: The size (volume) stayed the same despite more air (Air is compressible). Step 3: Both observations are supported.

Correct answer: Both (2) and (3)

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