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Re: [RC] [RC] Frozen Tanks (Mpemba effect) - Sky Ranch

Ok, regarding hot water freezing faster than cold.  I think it's the
alignment of the water molecules.  To freeze, to become ice, liquid water
organizes into crystals.  Hot (really hot) water is less dense than cold
water - there's more space between the H2O molecules... therefore easier to
form into crystals.

Anyway, that's my theory and I'm sticking to it.

Oh - and for the earlier post where the writer said if she added warm or hot
water to the buckets she didn't have ice in the morning ... well that
wouldn't work here.  I could put buckets of boiling water outside and have
solid ice on some nights, like tonight.  When I lived in Gunnison, Colorado,
I could put out a gallon jug of water and it would freeze solid within 30
minutes, on a -20 degree night with wind.

In northern Ontario I visited friends and was witness to BEER freezing in
the CAN before I could drink it, on a cold night - it was 40 degrees below
0, we each opened a can of beer, took a sip, and before we could take
another sip, the beer turned to slush.  True story.  It was in Kapuskasing,
Ontario - a very cold place in winter.   I was visiting from Texas - I was
terrified!

Carla Richardson
Colorado


----- Original Message -----
From: "Diane Trefethen" <tref@xxxxxxxxxxxxxxxxxx>
To: "ridecamp" <ridecamp@xxxxxxxxxxxxx>
Sent: Wednesday, December 14, 2005 5:32 PM
Subject: Re: [RC] [RC] Frozen Tanks (Mpemba effect)


Carolyn Burgess wrote:
Wikipedia.  Didn't anyone see the article in the last few days where an
employee posting erroneous information in Wikipedia about his boss.
This is not a scientific publication.

   Though cold water may usually freeze faster than warmer water, that hot
water CAN
freeze faster than cooler water is an established fact.  What's not so
established
is, "Why?"  The link I posted earlier was to an article published by the
University
of California, Department of Physics, written in Nov, 1998.
   You can Google literally hundreds of universities, research institutes
and
scientific journals that have published on this subject.  Here are just
three:

University of Alaska, Fairbanks, March 5, 1984
http://www.gi.alaska.edu/ScienceForum/ASF6/650.html

Georgia State University, Department of Physics and Astronomy
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/freezhot.html

And the granddaddy of science for many of us, Scientific American, October
21, 1998

http://www.sciam.com/askexpert_question.cfm?articleID=0008EB6B-6C7E-1C71-9EB
7809EC588F2D7



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Replies
Re: [RC] [RC] Frozen Tanks (Mpemba effect), Carolyn Burgess
Re: [RC] [RC] Frozen Tanks (Mpemba effect), Diane Trefethen