Truth-or-Peace t1_iy6z2hc 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
Good answer. A comparison could be drawn with sweat. Sweat cools your body by evaporating: the energy to change it from liquid to gas has to come from somewhere. Similarly, salted ice cools the ice cream by melting: the energy to change it from solid to liquid has to come from somewhere.
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