Eli5: Some ice cream recipes put ice + salt outside the recipient to make it cool faster. But in the winter, salt is put on snow on the street to melt faster. Why one make cool and other melt?

Question

Edit: thank you all for the explanations, I now have understood much more!

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Answer 1

The salt makes the ice melt at a lower temperature so the water transfers heat faster cooling the ice cream faster. On the road the salt still makes the ice melt at a lower temperature which means it melts off the road instead of staying ice.