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Mystery #1Tier 2mixtures / solutions

Why does sprinkling salt melt ice on the roads?

On a frozen winter morning, gritters scatter salt and the ice turns to slush. Salt isn't warm; it's the same cold temperature as the ice. So how can adding cold salt melt frozen water?

A roadside grit bin holding salt for icy winter roads.
Photo: Andy Pellew · CC BY-SA 3.0 · via Wikimedia Commons

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