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Dimensionless Ratio (en) > Logarithm Of Octanol Water Partition Coefficient (en) > Unitless (en) > Parts per billion (en)
Count (en) > Unitless (en) > Parts per billion (en)
Dimensionless Ratio (en) > Unitless (en) > Parts per billion (en)

优选词，正式主题词

61Parts per billion (en)  

定义

  • Dimensionless unit for concentration. Recommended practice is to use specific units such as $ug/l$.

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https://vocab.sentier.dev/units/unit/PPB

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