Standard Science Primary 4 Energy

A deflated balloon is stretched over the mouth of an empty glass bottle. When the bottle is placed in a basin of hot water, the balloon inflates. This happens because __________.

A the balloon gained heat and contracted
B hot water entered the bottle
C the air in the bottle gained heat and expanded
D the glass bottle gained heat and expanded
Show Worked Solution

Worked Solution

Step 1: Air in the bottle gains heat from the hot water via the glass. Step 2: Air is a gas and expands significantly when heated. 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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