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From: mjs@eagle.UUCP (M.J.Shannon)
Newsgroups: net.aviation,net.astro
Subject: Re: Something else to watch out for!
Message-ID: <1271@eagle.UUCP>
Date: Wed, 26-Jun-85 08:29:24 EDT
Article-I.D.: eagle.1271
Posted: Wed Jun 26 08:29:24 1985
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Xref: watmath net.aviation:1686 net.astro:699

> 
> If you identify a parcel of air in the atmosphere, and follow it as it
> enters a region of temperature/pressure such that its water vapor condenses,
> it will become a cloud; yet the mass of the parcel has not changed!
> Which is another way of saying that clouds are not something *added* to
> the atmosphere, and the mass of air to be moved is not different if the
> water is distributed as microscopic drops instead of as gas.
> 
> 			W. F. Linke

Yes, but the volume of that packet becomes somewhat smaller as the vapor
condenses to droplets.  If you consider that the volume of atmosphere an
extraterrestrial object must pass through is constant, then the amount of
mass it must displace is thus much greater.
-- 
	Marty Shannon
UUCP:	ihnp4!eagle!mjs
Phone:	+1 201 522 6063