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parts per million

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia 0.01 sec.
parts per million
The parts of a substance per million parts (by weight) of a solution; equal to 0.0001%. Abbr. ppm.


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u u u Early estimates by Santa Fe County consultants were that the contaminants under the site of the courthouse project was 7 parts per million.
2] concentration varies by less than 1 part per million from background levels, which are currently about 383 parts per million.
 
 
 
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