p p m

ppm

1.
Also, PPM, P.P.M., p.p.m. parts per million.
2.
pulse per minute.
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Collins
World English Dictionary
ppm
 
abbreviation for
1.  chem parts per million
2.  Also: PPM peak programme meter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

ppm abbr.
parts per million

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
ppm
  1. page per minute

  2. parts per million

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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