Jun Jie pumped air into a bicycle tyre until it was firm. He then left the bicycle under the hot sun for several hours. He noticed the tyre became even harder. Why?
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Worked Solution
Step 1: Gases expand when they gain heat.
Step [2-9]: The air inside the tyre gains heat from the sun and expands.
Step [2-9]: Since the volume of the tyre is limited, the expanding air increases the internal pressure, making it harder.
Correct answer: The air inside the tyre gained heat and expanded.
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