A) relative humidity is 100%
B) relative humidity is 90%
C) relative humidity is 50%
D) nothing can be said
Correct Answer: A
Solution :
The dew point of a given parcel of air is the temperature to which the parcel must be cooled, at constant barometric pressure for the water vapour component to condense into water. The dew point determines relative humidity. When the relative humidity is high, the dew point is closer to the current air temperature. If the relative humidity is 100%, the dew point will be equal to the current temperature, i.e., atmospheric pressure becomes nearly equal to the dew point.
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