So, what exactly happens when water freezes? Well, it's not just a matter of the temperature dropping to a certain point (although that's a big part of it). When water reaches its freezing point, the molecules start to slow down and come together, forming a crystal lattice structure that we know as ice.
But here's a fun fact: did you know that water is actually one of the few substances that expands when it freezes? It's true! This is why ice cubes float in your drink, and why lakes and rivers don't completely freeze solid in the winter. It's all about the density of water, baby!
At What Temperature Does Moving Water Freeze | Gas Furnace
Now, I know what you're thinking: what about supercooling? You know, when water stays in a liquid state even below its freezing point? Yeah, that's a thing, and it's actually pretty cool (again, sorry). But don't worry, it's not something you need to worry about in your everyday life, unless you're a scientist or a molecular gastronomist (yes, that's a thing too).