"Shortwave Sportfishing" wrote in message
...
On Tue, 13 Jun 2006 09:00:14 -0400, Harry Krause
wrote:

Butch Davis wrote:
There is a difference between a gas and a vapor? I thought there were
liguids, fluids, and gases. Fluids covering both bases? But with a
refrigeration background my thoughts are probably too simplistic.
Butch


It's been a while since I took a chem course, but I thought gases are
normally in that state, while vapors arise from liquids. Gasoline, for
example, is normally a liquid, but it releases vapors.

Technically, gases expand and contract under pressure and spread
uniformly through a cylinder. Vapors don't do that.

Water vapor is the same. The rest of the gases (particularly nitrogen,
which makes up most of the atmosphere) suck up the water vapor and we call
it humidity. (water vapor also won't compress)

RCE

www.eisboch.com