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JAMB Physics 1994 Question 25

Question 25

Change of State and Vapours

If a room is saturated with water vapour, the temperature of the room must be

  1. A.at 0°C
  2. B.above the dew point
  3. C.at 100°C
  4. D.below or at the dew point.
Show the answer and explanation

Answer: D (below or at the dew point.)

Explanation

Air is saturated when its temperature has fallen to the dew point; the air cannot be saturated while it is above its dew point.