Parts per million

Parts per million (ppm) is used to denote relative proportions in measured quantities; particularly in low-value (high-ratio) proportions.

Parts per million (ppm) is used to denote relative proportions in measured quantities; particularly in low-value (high-ratio) proportions. The ppm can be used as a measure of concentration on a weight or volume basis of a certain compound or chemical species.

The term ppm is equivalent to milligrams per litre (mg/L) – 1 ppm = 1 mg/L. In wastewater media the content of salt, ions or hydrogen sulphide is often stated in ppm.





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