(or preeminence of constant proportion), in chemistry, the dominion that the loved one proportions of the seven major constituents the seawater (other 보다 the hydrogen and the oxygen that the water itself) vary only slightly. Oceanographers usage the principle to calculate salinity, for example, by measure up the concentration of only one major ion in seawater, generally the chloride ion. The concentration that chloride ions, dubbed chlorinity, is climate multiplied by 1.80655 to achieve the salinity. The rule is named after the German-born chemist Wilhelm Dittmar, who very first discovered the constant proportions the the seven significant components the seawater (besides hydrogen and oxygen): sodium, calcium, magnesium, potassium, chloride, bromide, and also sulfate.

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