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TeachMeFinance.com - explain Parts Per Billion (ppb) Parts Per Billion (ppb) The term 'Parts Per Billion (ppb)' as it applies to the area of reclamation can be defined as ' A measurement of concentration on a weight or volume basis. Equivalent to micrograms per liter. One ppb is equivalent to one drop of water in 55,000 gallons'.The term 'Parts Per Billion (ppb)' as it applies to the area of the environment can be defined as 'Number of parts of a chemical found in one billion parts of a particular gas, liquid, or solid mixture. See concentration'.
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