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Rock salt melts ice by lowering the freezing temperature of water. To understand how rock salt lowers the freezing temperature of water, you need to know a few things about the properties of water, ice and rock salt. Water is made of tiny molecules that are always in motion. The molecules move faster when the water is warm and slower when the water is cold. Ice forms when the temperature is cold enough for the molecules to slow down and form bonds with each other; normally, this happens at 32 degrees F (0 degrees C). The colder the water is, the faster the ice forms because the water molecules are moving so slowly they can't shake free of the bonds.

....and the salt further helps us maintain water as it changes the sg....specific gravity

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