Re: Best Buy Treated Me Like a Thief

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Article #9257

#9257

From: Keith Williams
Date: Mon, 09 Jan 2006 21:13

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In article <43c2cd1f$0$815$8046368a@newsreader.iphouse.net>, 
veldy71@yahoo.com says...
> In mn.general Keith Williams <krw@att.bizzzz> wrote:
> > 
> > If that were the case there wouldn't be contrails.  When it's cold 
> > there is always visible water vapor in the exhaust.
> >
> 
> The dew point is very low when it is cold, so exhaust is largely water
> and carbon dioxide vapor.  Most car exhaust has a high amount of water
> vapor in it, which means when it leaves the exhaust pipe and cools to
> ambient conditions it hit 100% relative humdity, meaning that it hits
> the dew point and water droplets form.
>  
Yep.  At -20F my car's "contrails" never go away.  OTOH, at -30F 
they usually do.  ;-)

-- 
  Keith

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From: Keith Williams <krw@att.bizzzz>
Newsgroups: misc.consumers,chi.general,mn.general
Subject: Re: Best Buy Treated Me Like a Thief
Date: Mon, 9 Jan 2006 16:13:44 -0500
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