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At 12:25 PM 12/2/01, Jim Green wrote:zero C
At 23:51 01 12 2001 , Bernard C wrote:
Right, Hewitt plots (ordinate) the volume of one gram of water insteadof the
inverse. No matter, he's plotting water not ice. Ice (normal near
[ice I]) 917 kg / m^3 or sg ~ .92 Water @ 100 C is 1.04 mL / g or sg0.96 So
ice floats as per your experience (and mine).
Bernard, you seem to be missing the essential point -- the fact
that makes life possible! Water at freezing is less dense than water at
4C therefore water freezes on the _surface_ of the body of water.
Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen
This gee whiz item is a favorite of the divine design folks.
If water density uniformly decreased above freezing point,
it would cool at the surface of cooler air as usual - and becoming denser
when cooler then sink, until it reached it reached its density level.
Relatively warmer water at the bottom would rise, and so I suppose,
there might be a vigorous circulation while a temperature gradient exists.
And quite possibly on significant bodies of water, there would always be a
gradient, and a circulation, so that icing would be postponed perhaps
banished from significant bodies of water....
This does not seem specially lethal to life, when I consider the life that
thrives
in sulphide springs at great depths.
Brian Whatcott
Altus OK Eureka!