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parts per million

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
parts per million (PPM, ppm),
the ratio of the amount of one substance to the amount of another, expressed as a unit of solute dissolved in one million units of solution. It denotes the number of units of one substance relative to one million units of another substance. It may be further expressed in terms of mass-to-mass, volume-to-volume, or another relationship of units of measure.

parts per million
mg/kg or ml/l; see 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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