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Parts-per notation is often used describing dilute solutions in chemistry, for instance, the relative abundance of dissolved minerals or pollutants in water.The quantity "1 ppm" can be used for a mass fraction if a water-borne pollutant is present at one-millionth of a gram per gram of sample solution.
[21] After the German Army captured large numbers of the PPSh-41 in the course of the German-Soviet War of 1941-1945, Berlin instituted a program to convert the trophy weapons to use the standard German submachine-gun cartridge – the 9×19mm Parabellum.