______ is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapour content) in order to reach saturation.
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Correct answer: A
Explanation
The correct answer is option 1 i.e. Dew point temperature.
- The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to achieve a relative humidity (RH) of 100%.
- Dew point temperature is never greater than the air temperature.
- Therefore, if the air cools, moisture must be removed from the air and this is accomplished through condensation.