Hello Marcus The metric world pushed liter as the cubic unit and it became popular and also made SI popular.
On the other hand, the metric world did not stress 'are' (100 sq. meters) as the square unit and that is why the acre and square feet still rules even in metric countries. We have to be flexible and more PEOPLE oriented rather than PURITY oriented. Now I have set a target of drinking 2 liters of water / day as my doctor advised. Please dont tell me to take 2 cubic decimeters of H2O / 86,400 SI seconds. Madan --- Ma Be <[EMAIL PROTECTED]> wrote: > To: "U.S. Metric Association" <[EMAIL PROTECTED]> > Date: Thu, 28 Mar 2002 14:31:40 -0800 > From: "Ma Be" <[EMAIL PROTECTED]> > Reply-to: [EMAIL PROTECTED] > Subject: [USMA:19125] Re: What is an SI unit? > Organization: Angelfire > (http://email.angelfire.mailcity.lycos.com:80) > > Just a minor comment to emphasize the fact that the > liter is actually IMHO just a convenient "nickname" > for the dm3, and also a way to "cheat" the prefix > system somewhat. For example, if one kept the > "pure" m3 one would not be able to refer to > centiliters. Evidently the mL could also be > replaced by the cm3, etc... > > I see a similar "principle" here applying to the ha > as well, i.e. that this again is just another way > around the difficulty with finding > suitable/convenient "sizes" for surface areas. > > OBS.: I evidently would rather use "the real > thing", but I must be realistic as well and starting > to use dm3, cm3 and the likes may not be at the > right time yet... > > Marcus > > On Thu, 28 Mar 2002 12:31:57 > RobertHB wrote: > > 2002 March 28 > >What is an SI unit? > >In 19104 Bill Hooper says "The litre is not an SI > unit." Well, yes it is. > >This long-time problem arose even more strongly > with the millimetre. Could > >we > >really get away with telling people that the > millimetre is not an SI unit? > >We would > >be laughed out of town. Or people would say to > hell with SI. > > > >The CCU has treated this issue. Any unit, with a > prefix or not, formed from > >the > >base and derived units is an SI unit. Accordingly, > Section 2.2 of draft 5 of > >SI10 > >now says > > > > "The term SI units includes the SI base > units, the SI derived > > units, and all units formed from them using > the SI prefixes. > > > >The coherent property applies to units without > prefixes. > > > >The second paragraph of Section C.1, called C.1.1 > in draft 5, has the word > >"coherent" added to the text to read: > > > > "A great advantage of SI is that there is > one and only one > > coherent SI unit for each physical > quantity." > > > >Furthermore, what is the meaning of a requirement > that SI units be used? > >Section 3.3.2 Units in use with SI says: > > > > "Compliance with this standard includes the > use, as needed > > and convenient, of certain non-SI units > listed in Tables 6 > > and 7, as well as all the SI units, > including the multiples > > and submultiples." > > > >This makes it now easier to promote SI units. > > > > Robert Bushnell, PhD PE > > meteorologist > > chair ASTM E43 on SI > > > > > > > See Dave Matthews Band live or win a signed guitar > http://r.lycos.com/r/bmgfly_mail_dmb/http://win.ipromotions.com/lycos_020201/splash.asp > > __________________________________________________ Do You Yahoo!? Yahoo! Movies - coverage of the 74th Academy Awards� http://movies.yahoo.com/
