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The water in your pond has to lower to below freezing. It takes time for the heat of the water to transfer to the surroundings. The ground underneath the water probably isn't below freezing either, so it will be transferring heat to the water at the same time. Looking at the temperature history for the time in question, the high temperatures for all the ...


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Sodium chloride rock salt, NaCl, is usually used for de-icing roads. As mentioned in another answer, the dissolved ions lower the freezing point of water. Other kinds of salt are also used. Calcium chloride, CaCl2, is more efficient at melting ice. NaCl can not melt ice at temperatures lower than -18C (0 F). A saturated calcium chloride solution won't ...


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The kind of salt used to keep roads ice-free is rock salt. Rock salt is an evaporite, which was once a salt lake like the one near Salt Lake City in Utah called Bonneville Salt Flats. In the course of millions of years, many salt evaporite deposits have become buried deep underground. A mine typically produces thousands of tons per year. The reason it works ...


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