| ID | |
| Preferred Name |
ratio |
| Definitions |
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 ppm (parts-per-million, 10–6), ppb (parts-per-billion, 10–9), ppt (parts-per-trillion, 10–12) and ppq (parts-per-quadrillion, 10-15). |
| Obsolete |
true |
| In Schemes | |
| Type |
http://www.w3.org/2004/02/skos/core#Concept |
| creator | |
| definition | 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 ppm (parts-per-million, 10–6), ppb (parts-per-billion, 10–9), ppt (parts-per-trillion, 10–12) and ppq (parts-per-quadrillion, 10-15). |
| prefLabel | ratio |
| created | 2016-03-31 |
| broader | |
| deprecated | true |
| modified | 2018-06-18 |
| exactMatch |
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