According to
http://www.wordiq.com/definition/Parts_per_million
http://wyagric.state.wy.us/aslab/wmterms.htm
parts per million (ppm) - this is sort of a generic unit of measure in the sense that it can represent a lot different units of measure (e.g. mg/L, ug/ml, mg/Kg, lb/acre), therefore a ppm equals one part of something per million parts of something else. So if you have water quality data in mg/L, that data is equivalent to ppm (i.e. 50mg Calcium/L = 50 mg Calcium/1,000,000 mg water/L = 50 ppm Calcium). By the way, if you have soil test data in parts per ...
Solution Summary
The unit conversions for concentrations are analyzed.
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