On Mon, 17 Feb 2003, Terry Simpson wrote: > ... Handbook 130 says it is 28.3495 g. Thus either FS376B is the > superior source (for at least that unit) or there is a third document > that we don't know about.
Yes. See NASA SP 7012, US Government Printing Office. Ask for the 1973 Edition, not the first 1964 Edition. SP 7012(1973) gives "ounce mass (avoirdupois)" = 28.349 523 125 grams exact. Try calculating this number yourself from the definition of the pound mass. i.e. US pound mass (avoirdupois) = 0.453 592 37 kilogram exact. Note that "definitions" of almost all US non-metric units have not changed since the inch was redefined as exactly 2.54 centimeters (or 25.4 mm if you prefer) in all the major English speaking nations. Gene.
