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QPage 60: Q11: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 60: Q11 Solution: When a tyre bursts, the air coming out is cooler than the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often attribute the lower temperature of the escaping air to heat being transferred out of the tyre, when in fact the rapid expansion is essentially adiabatic—no heat exchange occurs and the gas does work on the surroundings, lowering its internal energy and thus its temperature. Remember: cooling here comes from internal‑energy loss to work, not from heat loss to the environment.

When a tyre bursts, the air coming out is cooler than the surrounding air. Explain.

Step-by-Step Verified Solution

**Answer:** The air coming out is cooler because of **adiabatic expansion**. **Step-by-Step Explanation:** When a tyre bursts, the air inside expands rapidly. The expansion is so fast that no heat exchange occurs with the surroundings (adiabatic). The air does work against the surrounding atmosphere, which decreases its internal energy. This decrease in internal energy results in a **fall in temperature**, making the escaping air cooler than the surroundings [citation:8][citation:10].

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