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並前往https://www.quora.com/Does-1-ppm-parts-per-million-1-ug-ml-and-also-1-mg-l

Does 1 ppm (parts per million) = 1 ug/ml and also = 1 mg/l?

1g per tonne is also 1 ppm. Because there is 1 000 000 gram in a tonne. 1 ug = 0.000 001 gram = 1 millionth of a gram. 1 ml (assuming water) is 1g.

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