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.
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