ppm Meaning in the Cambridge English Dictionary
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Meaning of “ppm” in the English Dictionary

"ppm" in British English

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ppmnoun [U]

abbreviation forpartsper million (= a ​unit for ​measuring the ​amount of a ​substance that is ​mixed with a ​liquid or another ​substance)
(Definition of ppm from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ppm" in American English

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ppmnoun [U]

chemistry abbreviation forpartsper million (= a ​unit for ​measuring the ​amount of a ​substance that is ​mixed with a ​liquid or another ​substance)
(Definition of ppm from the Cambridge Academic Content Dictionary © Cambridge University Press)

"ppm" in Business English

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ppmnoun [plural]

uk   us   MEASURES
abbreviation for partsper million: the ​amount of a ​chemical in relation to the substance that contains it: Lead ​levels in the water were above 3,500 ppm.
(Definition of ppm from the Cambridge Business English Dictionary © Cambridge University Press)
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