What does ppm mean?
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What does ppm mean? Who can explain it in detail?
A unit of weight, equivalent to 10^-6 g; it is no longer used nowadays, and has been replaced by the unit μg/g
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One part per million ml/L, mg/kg.......
PPM is a way of expressing solution concentration (the mass fraction of solute), with 1 ppm meaning one part per million. For a solution: that is, if there is 1/1000 milliliter of solute in 1 liter of aqueous solution, its concentration (mass fraction of solute) is 1 ppm. For gases: One of the methods for representing the concentration of pollutants in the ambient atmosphere (air). Volume concentration notation: the volume of pollutants contained in one million volumes of air, that is, ppm
It’s just a way of expressing a concentration unit
Parts per million, abbreviated as ppm (short for the English term Parts Per Million), is defined as one part in a million; 1 ppm means one part in one million. PPM can be used to describe quality; it indicates that there is 1 milligram of a certain substance in 1 kilogram of a material, and such a concentration is considered 1 ppm ； It can also be used in terms of volume: in a solution of 1,000 liters, if there is 1 milliliter of a certain substance, then the concentration of that substance is 1 ppm ； It is also possible to use both mass and volume; if there is 1 milligram of a certain substance in 1 liter of solution, then the concentration of that substance is 1 ppm. This is because, in the case of water, 1 liter of water weighs 1 kilogram, and the ratio of 1 kilogram to 1 milligram is exactly one million, which means 1 ppm = 1 mg/L.