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From: rpw3@fortune.UUCP
Newsgroups: net.physics
Subject: Re: none - (nf)
Message-ID: <2348@fortune.UUCP>
Date: Tue, 24-Jan-84 23:04:18 EST
Article-I.D.: fortune.2348
Posted: Tue Jan 24 23:04:18 1984
Date-Received: Fri, 27-Jan-84 09:27:07 EST
Sender: notes@fortune.UUCP
Organization: Fortune Systems, Redwood City, CA
Lines: 21

#R:sri-arpa:-1567000:fortune:8600009:000:777
fortune!rpw3    Jan 24 19:48:00 1984

Fog and clouds are NOT water vapor! Water vapor is CLEAR at all reasonable
temperatures and pressures. Just ask anyone who has burned themselves badly
on steam (vapor) they could not see! Look closely (from the side, please)
at the spout of a fiercely boiling tea kettle and you will see that the
first few centimeters of flow are clear.

Fog/clouds are condensed water droplets (liquid) in colloidal suspension in
water-vapor-saturated air (100% humidity). Therefore, depending on the density
of that suspension, the cloud/fog mass could be either lighter or heavier
than an equivalent volume of dry air.


Rob Warnock

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