Discussion
The dew point of moist air is the temperature at which
Answer: C
Correct answer: the air becomes saturated on cooling
Cooling moist air at constant pressure leaves the water content unchanged while the saturation capacity falls, and the dew point is where the two meet. Cool it any further and water condenses out. The dew point is therefore a direct measure of the absolute humidity, which is why it stays constant under heating and why it is used to specify dryness in compressed air systems.
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