Why do bicycle tubes burst mostly in summer?
In summer, the heat causes rubber to harden, reducing its flexibility. As a result, when air inside the bicycle tube expands due to the heat, the hardened rubber cannot adequately accommodate the increased pressure. This leads to increased stress on the tube, making it more prone to bursting.
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The correct answer is option C. In summer, the heat causes rubber to harden, reducing its flexibility. When air inside the bicycle tube heats up, it expands. However, the hardened rubber cannot expand adequately to accommodate the increased pressure. This results in heightened stress on the tube, making it more prone to bursting, specifically due to the rigidity caused by heat. Therefore, option C best explains why bicycle tubes burst mostly in summer. Options A and B are incorrect, as the tube doesn’t burst directly due to heat or because rubber becomes weak.