Standard Science Primary 4 Matter

Siti trapped some air in a syringe and blocked the nozzle. She found that she could still push the plunger in slightly. What does this tell her about the properties of air?

A Air can be compressed.
B Air has a fixed mass.
C Air takes up space.
D Air has no fixed volume.
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Worked Solution

Step 1: Identify the observation (plunger moves in). Step [2-9]: This means the volume of the trapped air decreased. Step [2-9]: Since gases have no fixed volume and large spaces between particles, they can be compressed.

Correct answer: Air can be compressed.

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