Preferred Name |
ratio |
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Synonyms |
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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). |
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ID |
http://vocabs.lter-europe.net/EnvThes/EUUnits_007 |
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Obsolete |
true |
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broader | ||
created |
2016-03-31 |
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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). |
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deprecated |
true |
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exactMatch | ||
inScheme | ||
modified |
2018-06-18 |
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prefLabel |
ratio |