Okay, practical stuff. The freezing point is why you must put antifreeze in your car’s radiator in winter. Without it, that water in your engine turns to ice, expands, and—BAM—you’ve got a cracked engine block. Your wallet will not thank you.
It’s also why salt on icy sidewalks works wonders. Salt lowers the freezing point of water, so it stays liquid even at 20°F. It’s like tricking the ice into melting, even though it’s cold enough to stay frozen. Sneaky, right?
But What About Other Stuff?
Water is the celebrity of freezing points, but other liquids have their own dramatic exits. Ethanol (aka the good stuff in booze) freezes at a bone-chilling -173°F (-114°C). That’s why your vodka doesn’t freeze in your freezer—unless you’re somehow living in Antarctica.
Mercury freezes at -38°F (-39°C), which is why old-school thermometers used it. It’s liquid for a huge range of temperatures, but if you’re ever in a deep freeze, it’ll go solid and break your thermometer. Just another reason to move to a warmer place.
