Question

There are two jars filled with air. The volume of air in both the jars is same. But Jar 2 has more water vapour than Jar 1.

Can you guess which one will exert less atmospheric pressure?

• A. Jar 1
• B. Jar 2
• C. Both the jars will exert the same amount of atmospheric pressure.
• D. None of the jars will exert atmospheric pressure.

Answer 1

The correct option is B Jar 2

Humidity refers to the quantity of water vapour present in the atmosphere. Compared to air, water vapour is lighter that's why it ascends. This is the reason why humidity has an inverse relation with atmospheric pressure.

In this case, Jar 2 is lighter owing to the presence of more water vapour in it. Thus, it will exert less atmospheric pressure compared to Jar 1.