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PPM stands for parts per million when reporting very small concentrations
Parts Per Million is the most common and important usage
PPM stands for "parts per million". It is a unit of concentration that denotes the number of parts of a substance per million parts of a solution. It is commonly used in fields such as chemistry and environmental science to express low concentrations of substances.
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100 ppm is worse than 50 ppm. The higher the ppm value, the more concentrated the substance is in the solution. In this case, a concentration of 100 ppm is twice as much as 50 ppm.
ppm stands for parts per million, which is a unit used to describe the concentration of a substance in a solution. It indicates the number of parts of a substance per one million parts of the solution.
The initials PPM could stand for Peter, Paul and Mary. Peter Yarrow, Paul Stookey and Mary Travers were popular folk singers in the '60s They wrote and sung songs like, Puff the Magic Dragon.
ppm
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Zn < O.6 ppm Fe < 4.5 ppm Mn < 2.0 ppm Cu < 0.2 ppm