Which of the following is the best indicator of the actual amount of water vapour in the air?
A
Air temperature
B
Saturation vapour pressure
C
Relative humidity
D
Dew point temperature
Correct Answer: Dew point temperature
Dew point is a good indicator of the air's actual water vapour content, unlike relative humidity, which takes the air's temperature into account. High dew point indicates high water vapour content; low dew point indicates low water vapour content.