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QPage 32: Q13: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 32: Q13 Solution: Is it possible to boil water at room temperature, say 30�C? If…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often equate boiling with a high temperature and assume a boiling liquid must feel hot; they forget that boiling occurs when the liquid’s vapor pressure equals the surrounding pressure, so at reduced pressure water can boil at 30 °C. Emphasize that the flask’s temperature, not the phase change, determines the tactile sensation.

Is it possible to boil water at room temperature, say 30�C? If we touch a flask containing water boiling at this temperature, will it be hot?

Step-by-Step Verified Solution

**Answer:** Yes, water can boil at room temperature if the pressure is reduced sufficiently. If you touch the flask, it will feel cold, not hot, because the water is at room temperature. **Step-by-Step Explanation:** Boiling occurs when the vapour pressure equals the external pressure. At 30�C, the saturation vapour pressure of water is about 4.2 kPa. If the pressure is reduced below this, water boils at 30�C. The water is at room temperature, so it feels cool, not hot.

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