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 requires energy to dissolve and it is taken from the thermal energy of the water and ice mixture and it gets colder. When the meeting point drops some of the ice will melt. Turing ice to liquid water requires energy and reduces the temperature
The salt is not put in the ice cream but in the ice and water mixture around it. The mixture with the salt will not freeze because its melting temperature is lower. There is no extra salt in the ice cream so its melting temperature has not dropped.
When you add salt to a roadway its temperature will drop. There is a minimum temperature that is useful for a road that is above the minimum freezing temperature of the nine
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