The concentration or amount of chloride ions present in seawater or other saline solutions, typically measured in parts per thousand (ppt) or grams per kilogram.
From chlorine + the suffix -ity (from Latin -itas), which creates abstract nouns describing a state, quality, or condition. The term became standard in oceanography in the 20th century.
Oceanographers measure chlorinity like doctors measure blood pressure—it's a fundamental property of seawater that indicates water mass movement, mixing patterns, and even historical changes in ocean circulation.
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