Science Fair Project Encyclopedia
Ppb
Parts per billion (ppb) is a measure of concentration that is used where low levels of concentration are significant. As the name implies, one ppb is the same as 1/1 000 000 000 or 10-7%. The ppm value is equivalent to the absolute fractional amount multiplied by one billion (109). You can read more about ppm and other similar units under concentration.
Similar units:
- Parts per million (ppm).
- Parts per trillion (ppt).
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