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...
Doug Miller wrote:

... another effect of the salt is that lowering the melting point causes
the phase transition -- which as RJK correctly pointed out is the step
that "eats" the most heat -- to occur much sooner.

I wonder what that means...

Nick

Maybe this will explain it. It is the latent heat of phase change.

http://daphne.palomar.edu/jthorngren/latent.htm