Doug's never wrong. Just ask him, he'll tell you.
"Mortimer Schnerd, RN" mschnerdatcarolina.rr.com wrote in message
...
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.


2. As you let air out of the tank, the pressure drops. This cools the
air (as p goes down, do does T).


The pressure also drops as the tank cools, whether it's being used or not.
So
does the dewpoint, so this is when normal air will start to condense.


3. Cold air holds less moisture so liquid water condenses from the
water vapor and collects in the tank.


That *is* correct.



--
Mortimer Schnerd, RN
mschnerdatcarolina.rr.com