Advanced Science Primary 4 Energy

An empty plastic bottle with a balloon over its neck is placed in hot water. The balloon inflates. What is the reason?

A The air in the bottle gained heat and expanded.
B The balloon material expanded.
C The bottle expanded and pushed air into the balloon.
D Water entered the bottle.
Show Worked Solution

Worked Solution

Step 1: The hot water transfers heat to the air inside the bottle. Step 2: Air (a gas) expands when it gains heat. Step 3: The expanding air moves into the balloon, causing it to inflate.

Correct answer: The air in the bottle gained heat and expanded.

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