From liquid to solid...help with science!
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From liquid to solid...help with science!

[From: ] [author: ] [Date: 12-07-05] [Hit: ]
it melts.When you open the bottle, you release the pressure, and it is finally able to completely freeze, which it will do right before your eyes.Usually,......
I would like to know why this happens and what is called.

Every time I put a bottle of water in the freezer and let it there for about 2 hours and then go check it to see if its somewhat frozen it looks completely crystalline, like its just cold and not frozen but if I remove the lid as soon as the air gets in it slowly changes its crystalline color into white and you can actually see that its not liquid anymore, its somewhat frozen but its not hard, its really soft.
Why does it happen? What is it called?

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The technical name is "It's not frozen yet". I'll explain.

When you have a sealed bottle of water, the water can't expand much. For the water to freeze, it needs room to expand. (The reverse is also true: if you take frozen water and squeeze it hard enough, it melts.)

When you open the bottle, you release the pressure, and it is finally able to completely freeze, which it will do right before your eyes.

Usually, this is seen with carbonated drinks. The dissolved carbon dioxide lowers the freezing point of the drink, and when you open the bottle, the release of the gas cools things down more (the reverse is also true: if you pressurize a gas, it gets warmer). Plus, as the carbon dioxide comes out of the drink, the freezing point is raised. And it freezes right in front of your eyes.

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I actually think its because it has not been disturbed. If you leave it in there with an open lid it wont freeze either.

But the second you disturb it, it will begin to crystallize. I dont remember the technical name for it but my environmental science teacher was telling our class they found a lake somewhere in well below freezing temperatures that was completely liquid. They went to take samples and the lake froze because it was disturbed. I took her word for it, i probably should have asked more questions haha

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When you open the bottle, you are introducing air into the bottle (gases). When they dissolve in the water and get trapped in the frozen water, they give the white appearance.
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