How can moist air be less dense than dry air?

Question

how can moist air be less dense than dry air

hey guyz i read this in a book please expalin it.

Answer 1

Water vapor is actually a lighter gas than O2 or N2!

Read all about it here:

Answer 2

If the moist air is very hot and the dry air is very cold.

Answer 3

Air and water density are both greatly affected by temperature.  Also air density is affected by pressure.

Answer 4

Don't confuse density with weight.  They are two different things.

Moisture takes up a certain amount of space in a given volume of air (more water molecules-less air molecules).  Remove the moisture and you have more air molecules in that given volume, therefore the air is denser.