Bob, You forget that resolutions of the CGPM are the authority for SI.
Recommendations by the CCU are not official SI until they are accepted by the CIPM, and resolved by the CGPM. Current documentation of SI is the BIPM Booklet, 7th Edition (1998) which promulgates resolutions of the CGPM. On page 92 is the statement: "It is important to emphasize that each physical quantity has only one SI unit,..." Until the GCPM and the BIPM declare otherwise, each physical quantity has only one SI unit. What CGPM resolution declares otherwise? ................. On Thu, 28 Mar 2002 [EMAIL PROTECTED] wrote: > In 19104 Bill Hooper says "The litre is not an SI unit." Well, yes it is. To the contrary, Bob, the liter is listed under "Non-SI units accepted for use with the International System"; Table 6, page 105 of the BIPM Booklet. > ... Section 2.2 of draft 5 of SI 10 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 joint IEEE-ASTM Committee on SI 10 does not have a resolution of the CGPM to back that statement, Bob. Even if it did, the liter would still not be an SI unit because it is not formed by an SI prefix. The statement would have to be rewritten to include certain derived units with special names. Certainly, the liter is a part of SI, but the liter *is not* an "SI unit" by the authority of current resolutions of the CGPM. Gene.
