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USGS Water Science School, parts-per notation (ppm = parts per million).
Water Education Foundation, 'Parts-per Notation.'
Arithmetic identity (self-checking unit conversions).
Author's synthesis (illustrative analogy). Arithmetic basis: 0.3 ppm = 1 part in ~3.33 million (see claim 11-7-3); $33,000 = 3,300,000 pennies; 38 days = 3,283,200 seconds.