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From: iles@hplabs.UUCP
Newsgroups: net.physics
Subject: Why your car exhaust is whiteish
Message-ID: <18600004@hplabs.UUCP>
Date: Fri, 4-Jan-85 23:26:00 EST
Article-I.D.: hplabs.18600004
Posted: Fri Jan  4 23:26:00 1985
Date-Received: Mon, 7-Jan-85 02:46:49 EST
Lines: 10
Nf-ID: #N:hplabs:18600004:000:357
Nf-From: hplabs!iles    Jan  4 20:26:00 1985

Car exhaust is visible because there is condensed water inside the tailpipe
and catalytic converter and until this water is expelled, it appears in
the exhaust as vapor/steam/water.

I think this is true.  It certainly seems plausible.

Rafi Esrael

(reply to Dan Lieman, at iles@venus, or anywhere at UC Berkeley Berknet,
 it will get to me eventually).