Standard Science Primary 4 Matter

Which of the following explains why we can pump more air into a bicycle tyre that is already firm?

A Air has a fixed volume.
B The tyre expands significantly.
C Air can be compressed.
D The air inside the tyre turns into liquid.
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Worked Solution

Step 1: Air is a gas. Step 2: Gas particles have large spaces between them. Step 3: This allows them to be pushed closer together (compressed) into a fixed space.

Correct answer: Air can be compressed.

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