A student asked me this today. I understand that salt doesn’t actually melt ice, but lowers its melting temp, but how do I explain this to a child?
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Salt changes how ice melts, making it melt faster, by making it easier to pull heat out of the thing that the ice is touching. If that thing the ice is touching is a metal container of ice cream mix, then pulling the heat out of it makes it freeze solid. Mixing it during this process introduces air to the frozen mixture, making it super good.
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