<s>[INST] when you put a water bottle into a freezer, an let it sit there without touching it, sometimes it will still be water but when you disturb it it will freeze all at once. why does that happen? [/INST] When the bottle is left undisturbed, the ice crystals that form on the outside can act as nucleation sites, which are small areas where the freezing process can begin. However, these nucleation sites may not be enough to start the freezing process throughout the entire bottle of water.

When you disturb the bottle, you're introducing more nucleation sites, which will cause the remaining liquid water to freeze all at once. This is due to the fact that the agitation causes the movement of the liquid and the introduction of more nucleation sites, which will allow the freezing process to continue throughout the entire bottle.</s>\ <s>[INST] Give me a short run down of your answer... [/INST] When a water bottle is left undisturbed, it has fewer nucleation sites than a water bottle that has been disturbed. If there are not enough nucleation sites in the water bottle, the water inside it may not be able to freeze. Once a bottle in that state is disturbed and more nucleation sites are created, all of the water in the bottle freezes at once.</s>