AbsentThatDay t1_iy6f29j wrote
I'm no expert, but I believe salt makes the freezing point lower, this allows the water the fills the whitespace in between the ice cubes to be colder. The water is more efficient at changing the temperature of the internal wall of the ice cream container in the middle because it presses up against it and the ice over a wide area, where the ice cubes only touch the inner wall at points.
LorenaBobbedIt t1_iy6l61b wrote
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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