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Dew pointThe 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. At this temperature condensation will begin, if conditions are suitable (presence of a solid surface or other condensation nuclei; otherwise see supersaturation), and water vapor condenses into liquid. When the dew point falls below freezing it is called the frost point.
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Dew point".