thebigger t1_iyc0i8z wrote
Reply to comment by kemptonite1 in 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? by zimobz
You do realize that in the ocean, when ice forms, that the ice is salt free because the ice is 'expelled' from the molecules that form the ice, and the lattice structure?
Ice by definition is essentially salt free.
When you make ice cream you rotate a bowl inside of another bowl, and there is fiction between these bowl. This friction creates energy, and when you put ice in between these bowls it will "grind" the ice, which helps the ice melt more quickly.
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