Concept information
There is no term for this concept in this language
优选词,正式主题词
‰Parts per thousand (en)
定义
- Dimensionless unit for concentration. Recommended practice is to use specific units such as $ug/l$.
上位概念
- C62 Unitless (en)
其它语言
URI
https://vocab.sentier.dev/units/unit/PPTH
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