Ron, Apparently, you are not familiar with the official documents on SI by the BIPM and by NIST.
In what *specific* ways do you conclude that they do not provide "quality information for using metric units" for any application, not merely for body mass and height? Gene. ---- Original message ---- >Date: Wed, 19 Mar 2008 01:13:05 -0700 >From: Ron Stone <[EMAIL PROTECTED]> >Subject: metrication productivity >To: [email protected] >Cc: [EMAIL PROTECTED] > > >Gene, > >This so much splitting of hairs, especially in the context of general >information about using metric measures for body mass and height. > >I disagree that any of the suggestions that you have commented below >improve on the scientific accuracy, or unambiguously clarify the >physical concepts of 'weight'. > >I will, however, try to respect your concerns about how your example >might be cited or presented. Please be advised, however, that your >opinions of the language are limited in merit. > >There is still the matter of a critical need for quality information >about using metric units for measuring body mass and height in the >USMA communities. > >Unfortunately, your comments relating to usages of the term 'weight' >do not in themselves provide a practical nor coherent rule for usage >of concepts relating to 'weight'. I think that other approaches would >be much more productive, and not less accurate. Such approaches would >also be more metric. > > >On 2008 Mar 15 Sat DoY 075, at 10:38, <[EMAIL PROTECTED]> <[EMAIL PROTECTED] > > wrote: >> Ron, >> >> See my replies below. >> >> Gene. >> >> ---- Original message ---- >>> Date: Thu, 13 Mar 2008 01:16:30 -0700 >>> From: Ron Stone <[EMAIL PROTECTED]> >>> Subject: Re: [USMA:40528] revised usage of measures for body mass >>> To: [EMAIL PROTECTED] >>> >>> >>> ------------ >>> Metric units are practical and suitable for everyday measures of >>> body mass... >> OK >> (oftentimes inferred by a measure of weight on a scale*) >> Delete this. Even bathroom spring scales are *calibrated* to >> display body mass *at a particular location*. Of course, balance >> scales free of springs measure mass more directly even though >> gravitational forces bring the masses into balance. >> >>> *Mass is oftentimes referenced by a measure of weight on a scale, >> Delete this. >> >>> however 'weight' is more specifically the product of a force such >>> as gravity that bears on a mass. >> This statement is completely false! Delete it. >> >> In a frame of reference other than the surface of the earth, such as >> the surface of the moon; the same body mass would experience a >> weight or force of gravity that is only about >>> 1/6 the gravity on the earth. Replace "gravity" by "weight" >>> ------------ >>> >>> I also like the example you wrote. Would you mind if I include the >>> three paragraphs below for purposes of general information handouts? >> You may use the example *without* the adulteration to which I >> objected above. >>> >>> On 2008 Mar 12 Wed DoY 072, at 09:26, <[EMAIL PROTECTED]> <[EMAIL PROTECTED] >>>> wrote: >>> >>>> A person of 60 kilograms body mass has a weight of about 600 newtons >>>> on the surface of the earth. >>>> >>>> That same person has the same body mass of 60 kilograms on the >>>> surface of the moon, but a weight of only 100 newtons on the surface >>>> of the moon where the acceleration of gravity is only 1/6 its value >>>> on the surface of the earth. >>>> >>>> All the above is by Newton's Second Law: >>>> "weight" is mass times the *local* acceleration of gravity in a >>>> specified (or implied) frame of reference, 9.8 meters per second >>>> squared on the surface of the earth with respect to the earth. > >- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >- - - - - - - - - - - > >Ron Stone > >e: > [EMAIL PROTECTED] > >web: > http://www.enhanceability.com > >- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >- - - - - - - - - - - > this message does not necessarily reflect > the views of any organization I may be affiliated with, > and should be regarded as personal opinion. >- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - >- - - - - - - - - - - > > > >________________ >smime.p7s (4k bytes)
