Dew point
The
dew point of a given parcel of air is the
temperature to which the parcel must be cooled, keeping pressure constant, for it to become saturated with
water vapor. At this temperature
condensation will begin if conditions are suitable (presence of a solid surface or other condensation nuclei; otherwise see
supersaturation)—water vapor then condenses into liquid
water called
dew. When the dew point temperature falls below freezing it is called the
frost point.
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