How does salt make icy roads safe?
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In addition to salt’s ability to melt snow and ice, undisolved salt also increases friction on the road surface. Salt chrystals are generally cube shaped so they don’t roll or slip passed each other very easily, snow and ice on the other hand form into little plate shaped chrystals that slide around like playing cards. Sand, ashes, and kitty litter can have the same effect as well, but none of those melt the ice
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