Hi Tom the use of avoirdupois measure is almost restricted to things other than rock. What is common is the gram. 1 ounce avoir. equals 28.35 grams, 1 ounce troy equals 31.103 grams. What we use is grams and kilograms (and of course, some sellers use pounds to help those who can't quite grasp metric). Now, I understand that the opal dealers use troy ounces in Australia, and that may be a standard outside of North America (or better stated as a convention and not a rule) since, as defined by the gemmological groups, one ounce equals 141 carats for gem weights (this is a standard now, they decided to round it off to an whole number as it used to be 141.75 carats to an ounce) and if you multiply 5 carats to a gram times 28.35 grams to an ounce you get 141.75 carats. So, this standard leaves out troy weights (which are typically used for precious metals) altogether. Thats the history in a nutshell. So, basicly, to make it simple after all that, we don't use either really, just grams and kilograms and the ounces are left out of the picture just so there isn't a problem.
Mark ----- Original Message ----- From: Tom aka James Knudson <[EMAIL PROTECTED]> To: meteorite-list <[EMAIL PROTECTED]> Sent: Sunday, June 08, 2003 10:28 PM Subject: [meteorite-list] avoirdupois ? > Hello List, This is meteorite related, it may not seem to be, but take it > from me it is! I am so confused, do we use Avoirdupois or what? I was doing > a conversion and was given a few choices and do not know for sure? Can some > one explain this to me? > Thanks, Tom > The proudest member of the IMCA 6168 > > > > ______________________________________________ > Meteorite-list mailing list > [EMAIL PROTECTED] > http://www.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
