Science Fair Project Encyclopedia
Parts per billion
Parts per billion (ppb) is a measure of concentration that is used where low levels of concentration are significant. The ppb value is equivalent to the absolute fractional amount multiplied by one billion (109).
See also
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details


