Prove that air contain water vapout

1.	Prove that air contain water vapout
Answer» Experiment : take a steel tumbler and put some well crushed ice into it. Wipe the tumbler from outside with a piece of clean , dry cloth so as to make its outer surface completely dry . Allow the ice containing steel tumbler to stand undisturbed for about five minutes. A large number of tiny drops of water appear on outer surface of steel tumbler . This proves that air contain water vapour.

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