Environmental Science
Which of the following is the best indicator of the actual amount of water vapour in the air?

Air temperature
Dew point temperature
Relative humidity
Saturation vapour pressure

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Environmental Science
Suppose it is a winter night and at about 11 p.m., the air cools to the dew-point temperature and a thick radiation fog develops. If the air continues to cool during the night, in 5 hours the dew point temperature will probably:

Increase as the air becomes moister
Decrease as the air becomes drier
Decrease as the air becomes moister
Increase as the air becomes drier

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