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ppm = parts per million, eg. 1ppm = 1 part out of 1 000 000 = 1/1*106
ppb = parts per billion, eg. 1ppb = 1 part out of 1 000 000 000 = 1/1*109
ppt = parts per trillion, eg. 1ppt = 1 part out of 1 000 000 000 000 = 1/1*1012

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15y ago

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