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Parts per million (ppm) is a measure of concentration that is used where low levels of concentration are significant. The ppm value is equivalent to the absolute fractional amount multiplied by one million (106). It is a term with several variants in meaning, so the meaning should be made clear if this term is used.

Parts per million is related to percent (parts per hundred) as follows:1% = 10,000 ppm or 1/100 = 10,000/1,000,000.

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