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This and That, Q&A Let's Share

How Does Salt Melt Snow?

SALT melts ice and snow by lowering its freezing point. Salt is best put on the roads before they freeze or before snow arrives. Then, as snow falls, the salt mixes with it, lowering it's freezing point. The result is a brine solution, preventing subsequent ice forming. If roads are already frozen solid, salt is far less effective as there's no liquid water on the surface.