FDLmold
Royal Flush
To complicate things even more, if you are doing parts-per-million particle counts on a liquid or solid, then that is neither percent volume (atoms have different volumes) NOR percent by weight (atoms have different weights). On the bright side, at least ppm for a gas is the same as % volume.Percentages is measured at PPM
1,000,000 PPM equals 100%
450,000PPM equals 45%
60,000PPM equals 6%
Etc, you get the idea.