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

On Feb 18, 4:01 pm, andy everett <vze2q...@xxxxxxxxxxx> wrote:

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.

Excellent!

Time to get a good thermometer.

Yes, absolutely. I'd just love to know the temp of the remaining
water, and the temp of the supercooled water pre-freezing.

BTW, can you photograph the ice crystals per the drop-in-the-snow
trick? How far down into the water did they extend? Also, how'd the
rate of growth of the crystals go, fast, then slow, or what?


Mark L. Fergerson

.

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