AIHA metrication update.

One of the major advantages of the SI is its precise nomenclature and rules of use. Close compliance with the SI nomenclature and rules of use assures that the SI are universally understood without additional parenthetical explanations. In the english system where symbols, abbreviations and other modifications are continuously changing one can never be sure what CFM, cfm, scf, acf, etc. mean unless the author first defines these abbreviations. More detailed information regarding the use of the SI are contained in the references cited at the end of this article.