Dew Point

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Dew Point

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The temperature to which a given parcel of air must be cooled at constant pressure and constant water-vapor content in order for saturation to occur; the temperature at which the saturation vapor pressure of the parcel is equal to the actual vapor pressure of the contained water vapor. Any further cooling usually results in the formation of dew or frost. Also called dewpoint temperature. </dd>
When this temperature is below 0� C, it is sometimes called the frost point. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use