Advanced Science Primary 4 Matter

Siti trapped 50 cm³ of air in a syringe and sealed the tip. She then pushed the plunger in. Which of the following shows the correct change in the volume and shape of the trapped air?

A Volume: Decreases; Shape: Changes
B Volume: Decreases; Shape: Remains the same
C Volume: Remains the same; Shape: Remains the same
D Volume: Remains the same; Shape: Changes
Show Worked Solution

Worked Solution

Step 1: Air is a gas. Step 2: Gases have no definite volume (can be compressed) and no definite shape. Step 3: Pushing the plunger reduces the space, so volume decreases and shape follows the container.

Correct answer: Volume: Decreases; Shape: Changes

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