What is “dewpoint”?
Dewpoint Temperature is defined as the temperature at which the amount of moisture present in the air would be the maximum amount the air could hold (at a constant pressure and water vapor content). If air is cooled without changing its moisture content, eventually a temperature will be reached at which the air can no longer hold the moisture it contains. At this point water will have to condense out of the air, forming dew or water droplets – it also may remain suspended in the air as fog or clouds. The dewpoint is the critical temperature at which condensation occurs. When temperature falls to the dew point, the relative humidity is 100% and the air is considered “saturated”. Dewpoint temperature is never greater than the ambient air temperature. It also does not vary with temperature, as does RH. Rather, dewpoint is a direct measure of the actual moisture content in the air and thus is preferred as the unit of measurement in many scientific and industrial applications – particularly
