单词	ppm
释义	English American Business ppmnoun [ U ] abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance) Thesaurus: synonyms and related words Miscellaneous units of measurement acre becquerel caloric calorific curie farad Gy hectare hertz horsepower kilohertz kilojoule lumen megahertz MHz molal molar newton SI unit watt See more results » ppmnoun [ U ] chemistry abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance) ppmnoun [ plural ] ukusMEASURES abbreviation for parts per million: the amount of a chemical in relation to the substance that contains it: Lead levels in the water were above 3,500 ppm.
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