1. Parts-per notationIn science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are ppm (parts-per-million, 10), ppb (parts-per-billion, 10), ppt (parts-per-trillion, 10) and ppq (parts-per-quadrillion, 10).
Read “Parts-per notation” on English Wikipedia
Read “Ppm” on Japanese Wikipedia
Read “Parts-per notation” on DBpedia
Read “Parts-per notation” on English Wikipedia
Read “Ppm” on Japanese Wikipedia
Read “Parts-per notation” on DBpedia
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