Freezing Point of Salt Water in Celsius

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If you keep piling on salt, the freezing point keeps dropping—but not forever. There’s a limit, a maximum chill called the eutectic point. For salt water (sodium chloride and H2O), that limit is about -21°C.

Freezing Of Water

Below that temperature, not even the saltiest brine can stay liquid. The whole mixture solidifies into a slushy, salty ice cube. It’s the point where even the rowdy party guests finally pass out.

So, no, you cannot make a zero-degree ocean freeze by “just adding more salt.” Nature has its limits, and they’re surprisingly polite.