Question

At what time of the day is the relative humidity normally at a minimum?
A. When the air temperature is highest
B. Just before sunrise
C. At midnight
D. When the air temperature is lowest

Answer 1

Hint: Humidity refers to the amount of water vapour present in the air. Absolute humidity, relative humidity, and specific humidity are the three most common humidity measurements. Let us learn more about the three major humidity measurements in this article. The ratio of the partial pressure of water vapour in an air water mixture to the equilibrium vapour pressure of water over a flat surface of pure water at a certain temperature is known as relative humidity.

Complete answer:
Option A: The water vapour content of the air at a given temperature is measured by relative humidity. The amount of moisture in the air is measured and compared to the maximum amount of moisture that the air may hold at the same temperature. The result is represented as a percentage. If the outside temperature is below \[20\] degrees, the interior humidity should not exceed \[15\% \]. If you're building a house or remodeling an existing one, insist on high-quality windows. U-values of \[0.35\] or less are recommended.
Hence option A is correct.
Option B: Humidity levels are higher at night because chilly air cannot hold as much moisture as warm air. The saturation point of cooler air is lower; therefore, moisture condenses on the ground as dew when the air can no longer hold it. The temperature and humidity levels are proportional. Cool air cannot hold as much moisture as warm air, but a closer look is needed to fully appreciate why this is the case.
So, option B is not correct.
Option C: Because cold air cannot contain as much moisture as warm air, humidity levels are higher at night. Cooler air has a lower saturation point, and moisture condenses on the ground as dew when the air can no longer contain it. Humidity levels are proportional to the temperature. Cool air cannot store as much moisture as warm air, but a closer examination is required to properly comprehend why this is so. We'll look at the numerous causes that prohibit chilly air from retaining as much moisture as its warmer counterpart.
So, option C is incorrect.
Option D: Relative humidity drops as the temperature rises, and relative humidity rises as the temperature falls. As the temperature of the air rises, it can store more water molecules, lowering the relative humidity. Relative humidity rises when the temperature drops. It’s referred to as humidity. The term "relative humidity" refers to the amount of moisture in the air at a certain temperature. The relative humidity drops when the temperature rises while the moisture in the air remains constant.
So, option D is not the correct one.

Hence, Option B is the correct answer.

Note:
Relative humidity is an important statistic in weather forecasting since it indicates the possibility of rain, mist, or fog. A rise in relative humidity raises the temperature of humans in hot summer weather by preventing perspiration from evaporating from the skin. Relative humidity is normally highest between midnight and early in the morning, then rapidly lowers when the sun rises, peaking soon after midday.