Questions regarding the testing laboratory
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In the units used for analyzing crude oil or gasoline and diesel, terms such as wt%, wt ppm, and ppb wt appear. I searched for a while but couldn’t find a satisfactory answer, so I’m reaching out to experienced professionals in this field for guidance. Thank you
wt%: represents weight percentage； wt ppm denotes the mass ratio, with the unit being parts per million ； ppb is a unit of one billionth
wt stands for weight, that is, mass or weight, as opposed to volume； % represents a percentage; ppm stands for part per million, which is 1/10^6; ppb stands for part per billion, which is 1/10^9. Their combination represents the content on a mass basis.