Standard Science Primary 4 Matter

Jun Jie weighed a deflated football. He then pumped air into it and weighed it again. He found that the mass increased. This proves that air __________.

A has mass
B has no fixed shape
C can be compressed
D occupies space
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Worked Solution

Step 1: The only thing added to the football was air. Step 2: The scale showed a higher reading (mass). Step 3: Therefore, the added air must have mass.

Correct answer: has mass

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