Salt Water Freezing Point Chart

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Remember that bag of pretzels you left on the counter? Salt draws out moisture—same trick it does with ice. That’s why cities dump salt on roads in winter: it melts the existing ice and stops new ice from forming down to about 15°F (-9.4°C).

PPT - Salt Changes the Freezing Point of Water PowerPoint Presentation

But not all salts are created equal. Road salt is mostly sodium chloride (table salt), but other salts like calcium chloride can drop the freezing point to -20°F (-29°C). That’s like saying, “Hey ice, you’re not tough enough to hang here.”

What About Your Homemade Ice Cream?

Ever made ice cream in a bag? You filled a big bag with ice, rock salt, and a smaller bag of cream. The salt lowers the ice’s melting point, making the ice colder without freezing solid. It’s a sneaky way to chill your dessert without a freezer.

Without that salt, the ice would just sit at 32°F. Instead, it drops to around 14°F (-10°C), which is perfect for turning cream into heavenly soft serve. Science tastes delicious.