Standard Science Primary 4 Energy

Ravi stretched a balloon over the mouth of an empty glass bottle. When he placed the bottle into a basin of hot water, the balloon inflated. Why?

A The balloon gained heat and contracted.
B Water entered the bottle.
C The bottle became larger.
D The air in the bottle gained heat and expanded.
Show Worked Solution

Worked Solution

Step 1: The hot water gives heat to the air inside the bottle. Step 2: When gases gain heat, they expand and take up more space. 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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