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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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6mo ago

PPM (parts per million), PPB (parts per billion), and PPT (parts per trillion) are used to express concentrations of substances in a mixture or solution. They are used to indicate the proportion of one substance in relation to the total amount of substances present, with PPM being the largest and PPT being the smallest unit of measurement.

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Q: What is ppm-ppb-ppt used to express?
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