LorenaBobbedIt t1_iy6l61b wrote
Reply to comment by AbsentThatDay 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
Yep. Salty icewater is colder than icewater without salt, so it’s better at chilling the ice cream.
thebigger t1_iy8ug7h wrote
Are you sure about that? Certainly if you're comparing ocean water to lake water you are correct, but adding salt to ice would be adding energy and slightly increase the temperature if I'm not mistaken.
The role the salt plays is that it facilitates the melting of the ice more quickly, which is colder, but I'm not sure that adding salt makes it colder.
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