Q. With reference to “water vapour”, which of the following statement is/are correct?
1. It is a gas, the amount of which decreases with altitude.
2. Its percentage is maximum at the poles.
Select the answer using the code given below:
Answer: A
Notes:
Exp) option a is the correct answer.
Statement 1 is correct. Water vapour is a variable gas in the atmosphere, which decreases with altitude.
Statement 2 is incorrect. Water vapour decreases from the equator towards the poles. In the warm and wet tropics, it may account for four per cent of the air by volume, while in the dry and cold areas of desert and polar regions, it may be less than one per cent of the air.
