What Is PPM?
PPM is definitely the most frequently used notation to measure mass https://sugararrangement.net/reviews/match-million/ and mole fractions, as well as this page other quantity-per-quantity measurements. Unlike the metric program, which uses units, the parts-per explication is a unitless, set of pseudo-units. The PP notation is also used for 100 % pure numbers, which in turn don't have [...]