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Parts per million

Ppm betyder miljondelar (från engelskans parts per million). 1 ppm (eller 1 miljondel) kan skrivas i bråkform och decimalform.
Bråkform Decimalform Ppm
0.000001 1 ppm
Om man har ett bråk som kan förlängas eller förkortas så att nämnaren blir 1000000 kan man göra detta först, och därefter läsa av antal ppm i täljaren, t.ex.

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