During the evening the partial pressure of water vapor in the air remains constant.As the temperature decreases,the relative humidity
A)stays the same.
B)increases.
C)decreases.
D)increases or decreases depending on the temperature.
E)More information is needed to answer this question.

Question

Quizplus · Accepted Answer

As the temperature decreases, the amount of water vapor that the air can hold decreases (this is due to the fact that cooler air is less able to hold moisture). If the amount of water vapor in the air remains constant (as stated in the question), this means that the air is approaching saturation with moisture. As a result, the relative humidity (which is the amount of moisture in the air expressed as a percentage of the maximum amount of moisture the air could hold at that temperature) would increase.

During the Evening the Partial Pressure of Water Vapor in the Air