But the 1/4 bottle was completely frozen while the unopened one was still completely liquid, so I don't think that could be it. I've seen the same thing happen with soda bottles left out in a truck overnight, if there was one that had been opened, no matter how much or little there was in it, they'd be frozen, but the unopened ones still looked okay. Until you opened them, that is, then they'd turn into instant slush. My ChemE friends would say this was because the soda had been 'under-cooled' (not sure of the english term) so that the fluid temperature was below freezing, and when the bubbles started stirring the fluid that triggered the freezing process. Kind of like when you have under-cooled rain, when it hits the ground it instantly turns to ice.
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