Verified Solution • 2025–26 Session moderate

QPages 34-37: Q48: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Pages 34-37: Q48 Solution: The temperature and the dew point in an open room are 20�C and…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistakenly assume the dew point changes when the room temperature drops, confusing it with the current temperature. Remember that dew point is determined by the absolute humidity (mass of vapor per volume), which remains constant in an open room as long as no condensation occurs; thus, the dew point stays at 10°C even when the air cools to 15°C.

The temperature and the dew point in an open room are 20�C and 10�C. If the room temperature drops to 15�C, what will be the new dew point?

Step-by-Step Verified Solution

**Answer:** New dew point = 10�C **Step-by-Step Explanation:** Dew point is the temperature at which the current absolute humidity equals the saturation vapour pressure. The absolute humidity (mass of water vapour per unit volume) does not change when the room is cooled from 20�C to 15�C (no condensation occurs until the temperature drops to the dew point). Since the original dew point is 10�C, and the room temperature (15�C) is still above this, no condensation occurs. The new dew point remains **10�C**.

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