Question

Why air containing more water vapour is lighter than the air without any water vapour?

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Answer 1

As water water is a form of liquid gas in the atmosphere but when this water vapour is cooled down then the air becomes heavy

Answer 2

THE REASON IS AVOGADRO'S LAW THAT SAYS THAT THE EQUAL VOLUMES OF ALL GASES AT THE SAME TEMPERATURE AND PRESSURE HAVE THE SAME NUMBER OF MOLECULES

AND THATS THE REASON WATER VAPOUR GOES UP AND FORMS CLOUDS AND COOL AIR SETTLE DOWN
AND AS WE KNOW WATER VAPOUR CONSISTS H2O SO AS WE KNOW WATER VAPOUR'S MOLAR MASS THAT IS 18.01g/mol AND AIR THAT CONTAINS MAINLY NITROGEN AND OXYGEN WHICH HAS A MOLAR MASS OF 28.97g/mol
SO, THAT IS THE REASON WATER VAPOUR IS LIGHTER THAN NORMAL OR DRY AIR