Can anybody please explain to me? So salt lowers the freezing point of ice right? When you put salt on your ice to make it colder, is there any heat transfer between the two?
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Yes and no. Basically, in the conditions where you’d normally be doing this, the ice has a surface coating of liquid water that’s constantly melting and refreezing. Phase transitions bind up energy – when the water freezes, it releases some energy, and when it melts, it sucks up some energy. Adding salt makes this salt water, which has a lower freezing point – meaning that the water can’t re-freeze. The ice continues to melt, though, which sucks up more energy, lowering the temperature of the ice.
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