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Parts per million

Parts per million (forkortet ppm) betyder milliontedele. Det anvendes til at angive en stofmængdekoncentration. I flydende form vil det være mg/l, i fast form mg/kg[1] og i gasform cm³/m³.

BIPM tillader anvendelsen af ppm sammen med SI-enheder.[2]

  1. ^ Parts per million (ppm) definition
  2. ^ SI Brochure: The International System of Units, Part 5.4.7

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