Freezing Temperature of Ocean Water

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Now for the quirkiest fact of all. When ocean water finally does freeze, it does a magic trick.

-Change in density of water at the surface as the freezing point of

The ice that forms is mostly fresh water. I’m serious.

As the water molecules lock into a crystal structure, they kick the salt out. It’s like a bouncer at a club, tossing out the rowdy guests.

This rejected salt forms super-concentrated, briny pockets. It’s called brine channels. These channels are so salty that they stay liquid even when the surrounding ice is rock-hard.

Polar bears and seals know this. They’re basically living on a giant Slurpee that’s actively rejecting its sugar syrup.

And It Makes Crunchy Ice

Ever bit into an iceberg? (Please don’t. It’s dangerous. But hypothetically.)

It would be crunchy, but in a weird, salty way. Because those brine channels are trapped inside the ice.

As the ice ages, those channels slowly drain out. That’s why icebergs are often described as “unusually clear.” They’ve had centuries to drip out all the salt. They’re basically ancient, frozen, purified rainwater.

And yes, you could melt an iceberg and drink it. It’s some of the purest water on Earth. Not the ocean around it, though. That stuff is still briny and cold.