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Converting ppm to micrograms.

If a patient has 0.08 ppm lead in their blood, how many micrograms would be contained in a liter of blood?

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The first thing to understand is the meaning of ppm (parts per million). Ppm is a unitless number, it just means that (in this case) we have 0.08 parts in 1 000 000, which can be 0.08 mole-parts in a million moles or, equivalently, 0.08 mg in a million mg, that is, in 1 kg. The main thing is that the two units should be the same (for the number and for the million). And ...

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