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Feb 22

Flash Frozen: Weird science from St. Joseph Island, Canada

Thanks Dave.

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Uploaded by SooToday on 6 Feb 2011

SooToday.com reader Phil Sabine is puzzled by what happens when he leaves bottled water in his truck during freezing weather

 

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Q:
I put a bottle of water in the freezer every night before bed. In the morning, I take it out and drink it. Sometimes its frozen solid, sometimes it stays liquid, depending on when I put it in there. But here’s the kicker, sometimes I will pull the bottle out, it will be liquid, but as soon as I open it, it starts to turn into ice, from the top down (it takes a few seconds for the entire bottle to freeze. Is there an explanation for this?
- Greg (age 26)
Army, Iraq
A:

We suspect that what’s happening here is that the water in the bottles which did not freeze overnight was “supercooled.” Water normally freezes when it is cooled below 0 degrees Celsius, forming ice crystals. Ice crystals form more easily when they grow on existing ice crystals — the water molecules like to pack themselves in place on a crystal that’s already gotten started. It doesn’t take much to start the crystallization process going — a little piece of dust or other impurity in the water, or even a scratch on the bottle are sometimes all it takes to get ice crystals growing. The process of starting off a crystal is called “nucleation.”

[more...]

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Steve Says…

Above Hoax Exposed ?

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Uploaded by PhysioRoomVideo on 3 Oct 2011

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