Parts Per Million (ppm)

Used to describe the amount of a trace element or substance present in the main substance.

Parts Per Million by Volume (ppmv)

Used to describe the amount of a trace element or substance present in the main substance as measured by volume.

PPMVD

The part per million concentration that is determined by comparing the volume of one constituent with the volume of the other constituents with the exception of moisture.

Parts Per Million by Weight (ppmw)

Used to describe the amount of a trace element or substance present in the main substance as measured by weight.

See also: Parts per Billion, Volume Percentage.

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Subjects: Chemistry Physics