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Part per thousand (ppt) is a unit of measurement that expresses the concentration of a substance in a solution or mixture. It indicates how many parts of a substance are present in 1,000 total parts of the solution. For example, if a solution has a concentration of 1 ppt, it means there is 1 gram of solute for every 1,000 grams of solution. This measurement is commonly used in fields like chemistry, environmental science, and water quality analysis.

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2mo ago

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