Is ppm an SI unit?
Answer (1)
21st Nov, 2022
Parts-per-million (ppm,10−6), parts-per-billion (ppb,10−9), parts-per-trillion (ppt, 10−12), and parts-per-quadrillion (ppq,10−15) are frequently used units. This notation lacks the International System of Units (SI) and has a murky definition.
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