odd science question

[Uturn]

Last night I put 3 water bottles in the freezer.  This morning, two of the three were frozen.  All three were the same manufacturer.  Why did the third not freeze?  I drank it anyhow, it was cold and didn't taste any different from the others, but just not frozen. 

[Davnasty]

In order for ice crystals to form a nucleation site is required. A seed crystal can form on some impurity in the water or due to an impact.

Bottled water may be more pure than tap water and therefore have less opportunities for crystals to begin forming.

https://en.wikipedia.org/wiki/Nucleation

https://en.wikipedia.org/wiki/Supercooling

If it's cold enough and you poor it out it will do this:

https://www.youtube.com/watch?v=Fot3m7kyLn4

[Bateaux]

Give it a good slap.   It will instantly crystallize most of the time when just at or slightly below the freezing point.  Given more time, all the bottles would have frozen if the freezer setting is low enough.

[PDXTabs]

I found this cool video: https://www.youtube.com/watch?v=ph8xusY3GTM

With that said, I'm still really confused about the temperature. Specifically, water needs to release 80 calories of heat to freeze 1ml of water, so what happens in the supercooled case?

[dragoncar]

a ghost