Jim Frysinger wrote in USMA 14378: >Those without a copy of SI 10 might not see the context in which the >dalton is listed. It is in the same table (Table A.1) as the denier and >the foot poundal. In no way, does SI 10 provide any support for its >usage. It does, however, provide a conversion to kilograms (without >even mentioning the unified atomic mass unit). > >The unified atomic mass unit, by contrast, is listed in Table 6--"Units >in use with the SI". That unit has a footnote symbol but neither the >line in the table nor the footnote mention the dalton. The footnote >provides the definition in terms of carbon 12. > >The words below, "dalton is a special name for the unified atomic mass >unit", are correct (at least to chemists), but not found anywhere that >I know of in SI 10. So, someone seeing "dalton" in a journal article >could learn its size from SI 10, but would not necessarily catch this >association. SI 10-1997 in Table A.1 lists both the dalton and the unified atomic mass, both does not explicitly point out that they are the same. Joseph B. Reid 17 Glebe Road West Toronto M5P 1C8 Tel. 416 486-6071
