Skunks, Sea Monsters and Parts per Million
Channel: Risk Bites
Date: 27/11/2012

http://youtube.com/riskbites

Parts Per Million (PPM) are often used to describe concentrations of potentially harmful substances.  But what do PPM actually mean?  This is a first of an occasional series of Risk Bites that take on PPM - this one looks at the importance of knowing what is being measured when PPM is calculated.

For more information on "parts per..." measurements, check out the very comprehensive Wikipedia page on the topic:  http://en.wikipedia.org/wiki/Parts-per_notation

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