What looks like holes are actually dimples. I guess I need to hold some of this stuff over the spout of a tea kettle to see if the steam (water vapor) passes through it and condenses on something cool held in its likely path.Humid air is less dense than dry air because a molecule of water (M ≈ 18 u ) is less massive than either a molecule of nitrogen (M ≈ 28) or a molecule of oxygen (M ≈ 32). About 78% of the molecules in dry air are nitrogen (N2). Another 21% of the molecules in dry air are oxygen (O2). The final 1% of dry air is a mixture of other gases.