John Kilopascal wrote in USMA 21030: > >The hour not only is not a coherent unit with SI, it isn't even an SI unit. >A unit such as the hour, that may have a special status (accepted) for use >with SI, does not make it an SI unit. The resultant combination of an SI >unit with a non-SI unit is still a non-SI unit. By your logic, we should >accept the FFU as a part of SI because they can be combined with SI (farads >per foot, grams per mile, watts per square inch, etc.). Of course, like the >hour they would not be coherent and would relate with an odd conversion >factor.
>John The hour is listed in the BIPM bible, "Table 6. Non-SI units accepted for use with the internatioinal system". The foot, mile and inch are not listed anywhere in the BIPM bible. Joseph B.Reid 17 Glebe Road West Toronto M5P 1C8 Tel. 416 486-6071
