Experts kindly help
Why does the density of air decreases when the moisture in it increases?

Dear student, 
The amount of vapour in air influence density. vapour is comparatively lightweight compared to matter element and matter N - the dominant parts in air.
When vapor content will increase in dampish air the number of element and N area unit shriveled per unit volume and therefore the density of the combo decreases since the mass is decreasing.
dry air is a lot of dense that wet air!

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