Verified Solution • 2025–26 Session moderate

QPage 33: Q16: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 33: Q16 Solution: Vapour is injected at a uniform rate in a closed vessel which…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often treat the injected vapor as an ideal gas and conclude that pressure must keep rising with added moles. In reality, once the vapor reaches its saturation pressure it begins to condense, so the pressure plateaus at the constant saturation value. Remember to invoke phase equilibrium when a gas can coexist with its liquid.

Vapour is injected at a uniform rate in a closed vessel which was initially evacuated. The pressure in the vessel

Multiple Choice Options

  • A increases continuously
  • B decreases continuously
  • C first increases and then decreases
  • D first increases and then becomes constant.

Step-by-Step Verified Solution

**Answer:** (d) first increases and then becomes constant. **Step-by-Step Explanation:** As vapour is injected, pressure increases. Once saturation is reached, the vapour begins to condense, and the pressure remains constant at the saturation vapour pressure.

All Questions in this Chapter

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