Question

Actual water vapour content in the atmosphere is
(a) Relative humidity
(b) Differential pressure
(c) Both A and B
(d) Absolute humidity

Answer 1

Hint: When the air is humid, it has a large amount of water vapour in it. Water in the form of gas in the atmosphere is called water vapour.

Complete answer:
The amount of water vapour in the atmosphere is termed as absolute humidity.
Absolute humidity: It is the measure of water vapour present in the atmosphere, despite the temperature. It is usually measured in grams of moisture per cubic meter of air (g/m3) .
Relative humidity: The quantity of water vapour in the atmosphere as compared to the volume of water that the air could hold is termed as relative humidity. It is usually measured in grams of moisture per cubic meter of air (g/m3) .
Differential pressure: It is the variation in pressure between two points. It is a type of pressure measured in different industries using differential pressure sensors. It is denoted in SI (International Systems of Units) units of a pascal.
So, the correct answer is “Absolute humidity”

Note: The maximum quantity of water vapour that can be present in the air is influenced by the air temperature. Warmer air can hold a higher amount of water vapour within it. Due to this the most humid days usually happen at the rise of summer heat. But as the temperature progresses downwards, the air can hold a lesser amount of vapour and some of it converts into liquid water again.