Uniksowy program units twierdzi że ppb dotyczy amerykońskiego biliona (z /usr/share/misc/units.dat):
ppm 1e-6 partspermillion ppm ppb 1e-9 partsperbillion ppb # USA billion ppt 1e-12 partspertrillion ppt # USA trillion
Pobieżny search w google (google:ppb units) też pokazuje: "units ppb (1/1,000,000,000)", czyli że ppb to 1e-9 (... na miliard) a nie 1e-12 (... na bilion). --Taw
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