Standard Science Primary 4 Matter

Siti tried to push the plunger of a syringe filled with air while covering the nozzle with her finger. She found that she could push the plunger in slightly. Why?

A Air has no mass.
B Air occupies space.
C Air can be compressed.
D Air has no definite volume.
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Worked Solution

Step 1: The plunger moves despite the nozzle being blocked. Step 2: This means the air inside is being forced into a smaller space. Step 3: This property is called compressibility.

Correct answer: Air can be compressed.

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