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PPM

Parts Per Million

Academic & Science » Units
What does PPM mean?
Parts Per Million (PPM) is a way of expressing very dilute concentrations of substances. One PPM means one in a million or 1/1,000,000. Usually describes the concentration of something in water or soil. One ppm is equivalent to 1 milligram of something per liter of water (mg/L) or 1 milligram of something per kilogram soil (mg/kg).
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