While at a friends house over the weekend, my friend and I opened a
bottle of seltzer (plain old carbonated water) and it instantly froze
(not the entire thing, but a good portion of it) The bottle had been
outside for a very long time in around 5 degree weather (degrees F)
and had not frozen, but the instant the seal was broken if froze. I
had originally thought that when the carbon dioxide that was dissolved
in the soda turned into a gas it would cool the seltzer quickly and
cause it to freeze, but why wasn't it frozen before I opened it? Just
to make sure that this was not a fluke, I put another un-opened
seltzer bottle outside for 6 hours (again around 5 degrees F). I know
that the bottle was below 32 degrees because ice had formed on it.
Again, the instant I opened it ice quickly began to form. Can someone
please help explain this?