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Begrepp

Parts per million

Ppm betyder miljondelar (från engelskans parts per million). ppm (eller miljondel) kan skrivas i bråkform och decimalform.
Bråkform Decimalform Ppm
ppm

Om man har ett bråk som kan förlängas eller förkortas så att nämnaren blir kan man göra detta först, och därefter läsa av antal ppm i täljaren, t.ex.

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