The inclusion of non-SI units in this text does not imply that the use of non-SI units is to be encouraged.
For the reasons already stated SI units are generally to be preferred.
The CIPM (2004) has revised the classification of non-SI units from that in the previous (7th) edition of this Brochure.
Table 6 gives non-SI units that are accepted for use with the International System by the CIPM, because they are widely used with the SI in matters of everyday life.
Finally, it simplifies the teaching of science and technology to the next generation if everyone uses this system.
Nonetheless it is recognized that some non-SI units still appear in the scientific, technical and commercial literature, and will continue to be used for many years.
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We live in a time when the marriage rate is going down, the co-habitation rate is going up, and the majority of first-born children are now born to unmarried parents.The SI base units, and the SI coherent derived units, including those with special names, have the important advantage of forming a coherent set, with the effect that unit conversions are not required when inserting particular values for quantities into quantity equations.Because the SI is the only system of units that is globally recognized, it also has a clear advantage for establishing a worldwide dialogue.Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.A copy of the license is included in the section entitled GNU Free Documentation License.Some non-SI units are of historical importance in the established literature.