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Dew Point Temperature
The dew point temperature is the temperature at which the saturation mixing ratio ws with respect to liquid water becomes equal to the mixing ratio w.
More simply:
The dew point temperature is the temperature to which air must be cooled at constant pressure for it to become saturated with respect to a plane surface of pure water.
A simple rule for converting RH to a dew point depression (T - Td) for moist air (RH >50%) it that RH decreases by ~1 degree celcius for every 5% drop in RH.
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