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Description
In science and engineering, the parts-per notation is a set of pseudo- units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per- quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million ( ppm , 10−6), parts-per-billion ( ppb , 10−9), parts-per-trillion ( ppt , 10−12) and parts-per-quadrillion ( ppq , 10−15). This notation is not part of the International System of Units (SI) system and its meaning is ambiguous.
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