Discussion
Three of the following stay constant when moist air is heated at constant pressure. Which is the odd one out?
Answer: A
Correct answer: the relative humidity
Heating at constant pressure adds no water and removes none, so the absolute humidity, the water partial pressure and the dew point all stay exactly where they were. What changes is the *saturation* pressure, which rises steeply with temperature - so the same partial pressure becomes a smaller fraction of it and the relative humidity falls. That is why heating a room dries the air without removing any water from it.
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