Standard Science Primary 4 Matter

A deflated basketball was weighed and its mass was 400g. After air was pumped into it, its mass was 415g. This shows that __________.

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

Step 1: Identify the change in mass (415g - 400g = 15g). Step 2: The only thing added was air. Step 3: Therefore, the 15g increase comes from the air added.

Correct answer: air has mass

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