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Parts per trillion

Parts per trillion (ppt) is a measure of concentration that is used where very low levels of concentration are significant. The ppt value is equivalent to the absolute fractional amount multiplied by one trillion (1012).

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Last updated: 05-26-2005 19:26:26
Science Fair Project Encyclopedia Contents Page
10-26-2009 08:16:03
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Science kits, science lessons, science toys, maths toys, hobby kits, science games and books - these are some of many products that can help give your kid an edge in their science fair projects, and develop a tremendous interest in the study of science. When shopping for a science kit or other supplies, make sure that you carefully review the features and quality of the products. Compare prices by going to several online stores. Read product reviews online or refer to magazines.

Start by looking for your science kit review or science toy review. Compare prices but remember, Price $ is not everything. Quality does matter.
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