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並前往https://people.cas.uab.edu/~vfedorov/Notes/Concentration%20units.pdf

Concentration units (density, ppm, ppb, molarity)

1kg/L, therefore 1 ppm ≈ 1 mg/L of a contaminant in water, and 1 ppb = 1 ug/L. However, you cannot use these relations if the solvent density is not 1 ...

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