It doesn't really, but it does keep the colder air from reaching it hence the affect of the melting process. It's okay for thin ice and mostly clear ice, but not if you're trying to break a chunk off your roof. If this is a question for homework, the answer is this: Salt doesn't melt ice. Instead, the properties of salt repel cold air and attract warmer air, seemingly melting the ice. It is efficient for sidewalks and small portions, but not for larger jobs. The ice does melt because the salt makes the freezing rate lower
Materials that melt ice quickly include but aren't limited to: Salt/Rock salt: Used in the winter, rock salt easily melts ice on most surfaces, regular salt would have the same effect on an ice cube. Water: Depending on the temperature and pressure, water can melt ice in a matter of minutes (or longer, depending on the thickness of the ice) Heat (in any form): The amount of heat and the time applied.
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