Parts-per notation/Definition

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https://en.citizendium.org/wiki/index.php?title=Parts-per_notation/Definition&printable=yes
A definition or brief description of Parts-per notation.

Notation used in science and engineering, to denote dimensionless proportionalities in measured quantities such as proportions at the parts-per-million (ppm), parts-per-billion (ppb), and parts-per-trillion (ppt) level.

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