What better place to try an experiment with super-cooled water than the antarctic!!We all know that water freezes at 32 degrees F, which is 0 to almost everyone in the world. That assumes standard pressure, since water under pressure can be colder than 32 degrees. I think it was actually the definition of “0 degrees C” at some point, so there isn’t a lot of information about water or freezing to say “water freezes at 0 degrees C”.
Another thing assumed is that there’s some seed-crystal. Water can get below 0 without freezing if there is no seed to “teach” the liquid water how to crystalize. One thing that will keep seeds from forming — or maybe to keep the seeds from finding liquid water to grow with — is to agitate the water.
And so, here on the cold continent, we find supercooled water — in the drink machine in the galley. The drinks vary from day to day, but water is always one of the offerings. When the water level is a bit low and the cooling is on full blast the water gets cold, but is keeps circulating, and these lovely crystals form.