How can you show that air contains water vapour 

Asked by kohinoorbegamislam | 19th Nov, 2018, 07:39: PM

Expert Answer:

The presence of water vapour in the air can be demonstrated by the following experiment:

We take a steel tumbler and put some well-crushed ice in it. Allow the steel tumbler to stand undisturbed for about 5 minutes with the ice in it. We would observe that a large number of tiny drops of water appear on the outer surface of the steel tumbler. This happens because the air around the steel tumbler contains water vapour in it. When this water vapour comes in contact with the cold, outside surface of steel tumbler, they condense to form tiny droplets of water.

Answered by Ramandeep | 20th Nov, 2018, 10:02: AM