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OpenStudy (anonymous):
This is opinionated, but lets say you wanted to test a water sample for a non-toxic chemical. ...Lets also say that technology improved so much at this current level, that you can analyze percentage to x decimal places. At what point does the percentage of the chemical become so minute, that it is utterly negligible, and basically 0? 1ppt? (1 microgram per Liter) 10^-20g per Liter?
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