Air conditioning definitions

By: Russell M. Keeler, PE

Condensation and the resulting mold formation is a big issue.  Here are some terms that relate to the subject.
  • Condensation is the change in matter of a substance to a denser phase, such as a gas (vapor) to a liquid.  Condensation commonly occurs when a vapor is cooled to a liquid.  
  • Dew Point is the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water (dew).
  • Relative Humidity is a term used to describe the quantity of water vapor that exists in a gaseous mixture of air and water compared to the maximum amount that could be retained.  As the air temperature increases, the amount of water vapor that can be held in the air increases.
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