Standard Science Primary 4 Matter

Study the two setups. Both flasks are identical and placed in hot water. Why did the balloon in Setup X inflate more than the balloon in Setup Y?

A Water expands more than air when heated.
B The balloon in Setup X is lighter.
C Air expands more than water when heated.
D Hot water transfers more heat to air than to water.
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Worked Solution

Step 1: Setup X contains air (gas) and Setup Y contains water (liquid). Step 2: Both gain heat from the hot water basin. Step 3: Matter expands when heated. Gases expand significantly more than liquids when subjected to the same temperature increase.

Correct answer: Air expands more than water when heated.

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