ST Alpha - "butbutbut I actually googled to make sure I had them the correct way!" (Reading a Post)

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In response to "This. Sort of. If you were to reverse it. The higher the humidity, the more dense. More humidity = more water vapor so there's more stuff in the air" by JD

butbutbut I actually googled to make sure I had them the correct way!

Posted by b. (aka starrynit) Jul 2 '12, 15:08

from wikipedia (and other sources, but it's at the top):

Humid air is less dense than dry air because a molecule of water (M ¡Ö 18 u ) is less massive than either a molecule of nitrogen (M ¡Ö 28) or a molecule of oxygen (M ¡Ö 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.

Responses:

Ummm. Stupid intuition. H2O mol weight = 18 vs N2 mol weight = 28. H2O vapor displace N2 so indeed lighter for given volume. - JD Jul 2, 15:34
here's the link for that. nm but: -- (link) - b. Jul 2, 15:09

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butbutbut I actually googled to make sure I had them the correct way!

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