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From: tino@hou2f.UUCP (A.TINO)
Newsgroups: net.physics
Subject: Sub-zero Seltzer!
Message-ID: <601@hou2f.UUCP>
Date: Fri, 27-Dec-85 12:50:24 EST
Article-I.D.: hou2f.601
Posted: Fri Dec 27 12:50:24 1985
Date-Received: Sat, 28-Dec-85 01:47:00 EST
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 17

An unopened bottle of salt-free seltzer, kept overnight in
a sub-freezing room, remained liquid.  I brought the bottle
into a warm room and immediately removed the twist-off cap.
Within seconds the liquid froze.  Very dramatic!

I can think of two contributing effects:
1) The increased pressure within the bottle suppressed the 
freezing point (as in regelation).  When the pressure was
released, the water froze.
2) The dissolved CO2 suppressed the freezing point.  When the
gas escaped, the water froze.

I think the second effect is the more important one. 
Any comments?

_______
Al Tino