Question

Assertion: Wet air is heavier than dry air
Reason: The density of dry air is more than density of water.
A. If both assertion and reason are true and the reason is a correct explanation of the assertion
B. If both assertion and reason are true, but reason is not a correct explanation of the assertion
C. If the assertion is true, but reason is false
D. If both assertion and reason are false
E. If the assertion is false, but the reason is true.

Answer 1

Hint: Wet air is the air that contains the highest level of water vapor. It is also known as saturated air whereas dry air is the air that has no water vapors i.e. air without moisture content or without humidity is dry air. Moreover, wet air is usually heavier than dry air.

Complete step by step answer:
Wet air is the air that contains the highest level of water vapor. In general, air contains some moisture or water vapor, regardless of the temperature and air pressure.
Further, the amount of moisture that air is capable of holding, depends on the temperature. The higher the temperature, the greater the amount of moisture the air can absorb.
Now, wet air is heavier than dry air because wet air contains water droplets in the form of moisture and thus resulting in the increase of density whereas the dry air is free of moisture and does not contain any type of particle. The density of air varies as the moisture content and the temperature of the air varies. So, when the temperature increases, the higher molecular movement results in an expansion of volume and thus there is a decrease in density. Moreover, the amount of water vapor in the air also affects the density.
Therefore, the given assumption is true i.e. wet air is heavier than dry air but the reason given is false.

Hence, Option C is correct.

Note:
An accurate measurement of saturated air levels is essential to prevent damage due to corrosion. Further, the air that is too dry can lead to cracking in equipment such as pipes and barrels. In industrial operations that necessitate cooling, a lower level of saturated air can result in ineffective cooling or evaporation.