On Fri, 27 Apr 2007 17:51:18 GMT, (Doug Miller)
wrote:

In article , "Mortimer Schnerd, RN" mschnerdatcarolina.rr.com wrote:
Doug Miller wrote:
1. Compressor takes in outside air, which typically has water vapor
in it, and packs it into the tank, thus raising the pressure.

And thus condensing the water vapor into liquid. End of story.


Only supersaturated air will condense upon compression. Normally, it won't
happen.

Incorrect. Consider that pressures of 135psig ( = 150psia, or 10 atmospheres)
are common even in small portable compressors.


From my college physics class... There is a sealed room with two
bathtubs at normal temperatures and pressures. One bathtub is full of
water at 90 degrees F. The other bathtub is empty and has a
temperture of 72 degrees on the insides, the lowest temperture in the
room. What happens in this closed system is all the water will
evaporate from the 90-degree tub and the water vapor will condense
into the 72-degree tub. This makes sense why houses have damp
basements.