Water is one of the most common substances on the planet, as well as being vital to life. As a result, the physical properties of water have been well studied and are known to a high degree of precision. The unit weight of water is one such property.
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Municipalities in the United States have added fluoride to drinking water since 1945. In small amounts, this chemical can provide healthier teeth. However, in some circumstances, groundwater sources can contain too much fluoride. The water purification method of reverse osmosis can remove fluoride.
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