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2.2 Relative Humidity and Dew Point
Relative humidity: Relative air humidity means real vapor content to saturated
vapor at the same temperature in percentage.
Dew point: it means that temperature when the saturation vapor begins to dew.
When the relative humidity is 100%, the ambient temperature is the dew point
temperature. The lower of dew point temperature (than the ambient temperature)
is, the less possible to dew, that also means the more drier the air is. The dew
point will not be influenced by temperature, but influenced by pressure.