What evidence is there to show that there is water vapour in the air?

What evidence is there to show that there is water vapour in the air?

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Take two drinking glasses. Ensure that their outside surfaces are dry. Pour equal quantity of water into both of them. Then in one of them put some pieces of ice cubes. Wait for some time and examine them.


Observations
The glass with ice has colder surface and a lot of moisture condensed on its surface on its outside.

Conclusion
- This moisture on the outside of the cold glass must have come from the air. Therefore air contains water vapour which condenses on the cooler surface.
- To proove that this moisture is actually water, anhydrous copper II Sulphate on it which and after the reaction, white Copper II Sulphate turns blue.

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Kavungya answered the question on March 25, 2019 at 09:10

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