★Why do we put salt on sidewalks when it's snow ?....
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When added to ice, salt first dissolves in the film of liquid water that is always present on the surface, thereby lowering its freezing point below the ices temperature. Ice in contact with salty water therefore melts, creating more liquid water, which dissolves more salt, thereby causing more ice to melt, and so on.
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Answer:The biggest reason for pouring salt on icy roads is that salt lowers the freezing point of water. Water normally freezes at 32 degrees Fahrenheit, but when you add salt, that threshold drops to 20 degrees (or even 2 degrees) Fahrenheit. ... You can watch as the water surrounding each grain of salt melts.
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