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Supercooling occurs because, contrary to popular belief, water can exist as a liquid below its natural freezing point if it has no surface or seed on which to crystalize. That is, if there is no rough surface, impurtiy, or bit of ice to start the crystalization process, water can remain in a liquid state below 0deg Celsius. The inside of a smooth plastic bottle could possibly provide the right environment for this. When it is poured out, however, it encounters something in the bowl that it can form crystals on, and the process begins. Thus, you see the supercooled liquid water pouring out and forming ice instantly when it hits already formed ice crystals, hence the strange "snaking" up of the ice slush. It doesn't all freeze (thus slush, not solid ice) because when water does freeze, it releases some heat in the process of crystalization (there is more energy present in water at 0deg than in ice at 0deg), and this probably raises some of the surrounding water to above 0 degrees.

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15y ago
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9y ago

There are quite a few reasons why your bottled water appears to freeze after removing it from the freezer. This is because it did freeze.

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11y ago

water expands as it freeze.doesn't have room to go some place it can burst the container it's in.

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12y ago

Obviously. It's just a physical change to the water. It's still H2O.

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11y ago

Ice is less dense than water. So when ice turns to water it expands.

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6y ago

Of course it freezes, if you get it sufficiently cold.

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15y ago

Because water expands as it freezes

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Q: Why does a water in a water bottle expand when frozen?
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