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                                                                Dew Point

       All air contains water vapour of varying quantities. The dew point
   indicates the amount of moisture in the air. The higher the dew point,
       the higher the moisture content of the air at a given temperature.
       Conversely, the dew point of humid air will be higher than the dew
                                                        point of dry air.

     Dew point temperature is defined as the temperature to which the air
       would have to cool (at constant pressure and constant water vapour
      content) in order to reach saturation. A state of saturation exists
   when the air is holding the maximum amount of water vapour possible at
                                   the existing temperature and pressure.

       Condensation of water vapour begins when the temperature of air is
           lowered to its dew point and beyond. The dew point, like other
         measures of humidity, can be calculated from readings taken by a
                                                              hygrometer.

   [figure.jpg] Dew point temperature



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