WHAT IS DEW POINT?

 

Dew point can be defined as the temperature at which the water vapor pressure of the gas equals the saturated water vapor pressure.  In other words, it is the temperature at which condensation will just begin to occur as the gas is cooled.  Dew point and relative humidity are not the same measurement.  Relative humidity is the amount of water vapor in the air compared to the amount the air could hold if it was totally saturated, and it is expressed as a percentage, not a temperature.  To determine dew point, two main variables are required: relative humidity and temperature.  The DP2000 measures both variables to compute the displayed dew point.