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Concepts Of Physics MCQ Edition [Volume 2]PhysicsKinetic Theory of Gases

A closed bottle contains some liquid. As time progresses, the amount of the liquid stays constant. In the remaining space of the bottle, the vapour

Options

  1. Amust be saturated
  2. Bwill be completely absent
  3. Cmay be unsaturated
  4. Dmust be unsaturated

Correct answer

A. must be saturated

Step-by-step solution

Since the amount of liquid in the closed bottle remains constant as time progresses, the system has achieved a state of dynamic equilibrium. At this stage, the rate of evaporation of the liquid is exactly equal to the rate of condensation of the vapour. This equilibrium condition implies that the space above the liquid contains the maximum possible amount of vapour at the given temperature. Therefore, the vapour in the remaining space of the bottle must be saturated.

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