Ah, the ocean. Salt water freezes at a lower temperature. That’s because salt lowers the freezing point. For typical ocean water (about 3.5% salt), it freezes around -2°C. So, your morning coffee? Don’t salt it to keep it from freezing—that would taste awful.
Why does salt do this? The salt molecules get in the way of water molecules trying to form ice crystals. It’s like putting a bouncer at the door of an ice party. The party starts later.
This is why we throw salt on icy roads. It melts the ice by lowering its freezing point. So, next time you see a salt truck, give it a little salute—it’s doing chemistry for you.
Pressure Matters Too!
Here’s another twist: pressure changes the freezing point. Under high pressure, water’s freezing point drops. That’s why you can skate on a frozen lake—the pressure of the skate blade melts a tiny layer of ice, letting you glide. Cool, huh?
What Temperature In Fahrenheit Does Water Freeze | Detroit Chinatown
But if you crank up the pressure enough, water can stay liquid at -20°C. That’s like saying a snowman can stay a puddle in a blizzard. Don’t worry, you won’t experience that on your driveway. Unless you drive a tank.
