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What is the name of the temperature at which air becomes saturated and water vapour begins to condense?

  • A

    Dew point

  • B

    Adiabatic threshold level

  • C

    Condensing value

  • D

    Soakpoint

The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve saturation (= a relative humidity (RH) of 100%). In simple words, it is the temperature at which the air can no longer "hold" all of the water vapour which is mixed with it - and some of the water vapour must condense into liquid water. The dew point is always lower than (or equal to) the air temperature.

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