Standard Science Primary 4 Energy

Tim placed an empty plastic bottle with a balloon over its neck into a basin of hot water. The balloon inflated. Why?

A The balloon produced more air.
B The plastic bottle contracted.
C The air inside the bottle expanded when it gained heat.
D The hot water entered the bottle.
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Worked Solution

Step 1: The air inside the bottle gains heat from the hot water. Step 2: When air (gas) gains heat, its particles move further apart, causing expansion. Step 3: The expanding air moves into the balloon, causing it to inflate.

Correct answer: The air inside the bottle expanded when it gained heat.

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