Posted: 23 January 2001

Condensation in the environment is most frequently associated with the change of water vapour into liquid water in the atmospheric environment. It is generally brought about by cooling, which reduces the ability of the atmosphere to absorb and retain water vapour. If a parcel of air containing a specific volume of water vapour is progressively cooled, it will reach a temperature at which it is completely saturated - the dewpoint temperature of that parcel of air. Any additional cooling beyond the dewpoint will cause the condensation of some of the vapour.