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Omvandla ppm till bråk

Ppm betyder miljondel, vilket skrivs som

1 0^{- 6}

på tiopotensform. Enligt potenslagarna kan man istället skriva detta som

\frac{1}{1 0 ^{6}} .

Det innebär att man t.ex. kan skriva om 4 ppm enligt

4 ppm = 4 \cdot \frac{1}{1 0 ^{6}} = \frac{4}{1 0 ^{6}} .

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