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TeachMeFinance.com - explain Parts per million (ppm) Parts per million (ppm) The term 'Parts per million (ppm)' as it applies to the area of reclamation can be defined as ' A measurement of concentration on a weight or volume basis. Equivalent to milligrams per liter (mg/l). One ppm is comparable to one drop of water in 55 gallons'. The term 'Parts per million (ppm)' as it applies to the area of the environment can be defined as 'Number of parts of a chemical found in one million parts of a particular gas, liquid, or solid. See concentration'. The term 'Parts per million (ppm)' as it applies to the area of nuclear science can be defined as ' Parts (molecules) of a substance contained in a million parts of another substance (e.g., water). '. Previous 5 Terms: Partners for Wildlife Partners in Quality parts per billion Parts Per Billion (ppb) parts per million Next 5 Terms: Pascal pascal Pascal (Pa) pascual Pass About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.