20(f) Replace the following with a word or a phrase.
the amount of water vapor present in the air
The amount of water vapour present in the air is referred to as Humidity.
Give one word/a fo words for each of the following.
Water vapor in air
The amount of water vapor present in the air is known as___
28. Replace the following with a word or a phrase.
e. reservoirs of underground water
h. water infected with undesirable germs and wastes