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Melting and Freezing

Does adding s...

Question

Does adding salt to ice and water cause a temperature drop?

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Solution

Yes. This is how old-fashioned ice cream makers lowered the temperature of the ice cream below water's ordinary freezing point. A mixture of rock salt, ice, and water packed in the bucket around the ice cream mix can bring the temperature down as low as $- 21^{\circ}$ C.

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