Re: Shake some supercooled water and you get ice, why?

Edward Green wrote:
On Feb 18, 1:49 pm, "n...@xxxxxxxx" <Alien8...@xxxxxxxxx> wrote:

<...>

Has the effect been seen in _moving_ water? I mean bulk motion, even
though it's intuitively apparent that supercooled water probably
supports little to no internal convection currents.

If it cannot happen if the water is moving because turbulence
supplies the "knock", in what sense can supercooled water be said to
be liquid?


I've read part of the (long) paper. Some pages missing.

Some of Dorsey's key points seem to be that a sealed ampule of water
-- a given sealed ampule -- has a reproducible temperature of sudden
freezing, and that above that temperature the liquid is not very
sensitive to agitation.

Maybe I should use glass containers, see below.


At least for some samples. That does not agree with my extensive
experience with supercooled beer, which does seem to solidify given
merely agitation. Though now I can't remember if that happens before
you open it, which would add more variables. I see I will have to
retread the rigorous experimental regime this summer. :-)

It is sometimes possible to pour supercooled water (he claims), so it
is certainly liquid.



I set out 5 half litter bottles of spring water after lunch. Temps just below freezing. Around 6 pm, temps now in the low 20's, I put a chunk of ice into one of the bottles, being careful opening the cap. Ice instantly formed around the piece of ice. We know now the water in the bottles are in a super cooled state. Next grab a bottle and shake vigorously in such a way to impart circular motion. Small crystals seen. Allow things to cool further. Open cap carefully and drop in a very small amount of snow. Starting from the top a pretty group of ice crystals forms.

On the last bottle I shook vigorously, the bottle became cloudy with crystals, quickly I poured the mixture of water and crystals into a measuring cup and filtered the crystals out with a paper towel. The paper towel was squeezed to get more of the water out. Out of 16.9 oz. of water less then .9 oz of the water was ice.

Time to get a good thermometer.



.

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