D-dawg

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Relative Humidity

In reference to the "lightness of water"-- what I meant was the weight of water molecules (oxygen=16 + 2 Hydrogen = 18) versus N2 (28) and O2 (32). Assuming the water molecules have the energy to stay unattatched to other water molecules (and thus form a droplet too heavy to stay afloat), they have less density (or maybe mass, not sure) than the surrounding air. Make sense or did I butcher this completely? (Gaviidae) 82.93.133.130 23:09, 2 December 2006 (UTC) (you can answer me either talk page)

Also, if the lightness of the water molecules has nothing to do with RH and only AH, then it's also mentioned under Other Important Facts, six paragraphs down. 82.93.133.130 23:13, 2 December 2006 (UTC)

March 2007

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October 2009

Dependence of RH on other gases

I'm wondering if you could explain a bit further the following statement you've made recently in connection with the article on relative humidity:

RH does not depend on other gases [i.e. other than water vapor] AT ALL.

The reason I'm asking this is that there seems to be a simple argument for the opposite conclusion. Here it is:

Consider a sample of n_H2O(g) moles of water molecules in a volume V at temperature T. Now let us vary the concentrations of other gases present in the sample, while keeping n_H2O(g), V, and T constant. As we do so, the partial pressure of water vapor remains constant, but saturated vapor pressure of water changes (slightly), due to the pressure enhancement factor. Thus RH=(partial pressure)/(saturated vapor pressure) changes as well.

Therefore, in the above process, RH was changing solely due to changes in the concentrations of other gases present; the concentration and temperature of water vapor were not changing. Surely, given this, it is incorrect to say that “RH does not depend on other gases AT ALL?”

That's the argument. Is there anything wrong with it?

By the way, I will copy the substantive portion of this to the discussion page of the article, which is probably a better place to continue this discussion. Reuqr (talk) 02:01, 26 October 2009 (UTC)

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