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TeachMeFinance.com - explain parts per billion parts per billion The term 'parts per billion' as it applies to the area of Earth observation can be defined as ' A unit of measure used for very small quantities, it is equal to the ratio of the weight or volume of one component of a mixture to a billion weights or volumes of the mixture. When based on weight (ppbw), it is equal to the weight or mass of the component divided by the total weight or mass in a given volume, multiplied by one billion. When based on volume (ppbv) it is equal to the volume of the component divided by the total volume of the mixture, multiplied by one billion'. The term 'parts per billion' as it applies to the area of water can be defined as 'the number of 'parts' by weight of a substance per billion parts of water. Used to measure extremely small concentrations'. Previous 5 Terms: partim Partly Cloudy Partly Sunny Partners for Wildlife Partners in Quality Next 5 Terms: Parts Per Billion (ppb) parts per million Parts per million (ppm) Pascal pascal 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.