W H Emerson 2004 Metrologia 41 L33 doi:10.1088/0026-1394/41/6/L02
W H Emerson
Show affiliationsThe International System of Units is presented in the SI brochure, where not only are the base units of the System defined, but many of the System's derived units are also proposed. The latter are of quantities that the brochure names but does not define; they are well-known quantities or are derived in definitions to be found elsewhere. However, many of the brochure's derived units have been subject to algebraic manipulation that makes them unrecognizable as units of the defined quantity. They do not conform to the VIM's definition of 'unit' and are in no sense units of the quantities with which they are associated. This paper questions their usefulness and suggests that derived units be defined only by the definitions of their quantities and of the base units of the system. They cannot be simplified algebraically and remain units of those quantities.
Issue 6 (December 2004)
Received 11 August 2004
Published 16 November 2004
W H Emerson 2004 Metrologia 41 L33
G. Platania and R. Rosania 1997 Europhys. Lett. 37 585
P Weinberger et al 1996 J. Phys.: Condens. Matter 8 7677
John D Barrow and Hideo Kodama 2001 Class. Quantum Grav. 18 1753
Joaquim Anacleto and Joaquim Alberto C Anacleto 2008 Eur. J. Phys. 29 555
Shaaban Khalil 2002 J. Phys. G: Nucl. Part. Phys. 28 2207
Chao Li et al 2008 J. Phys. D: Appl. Phys. 41 032005
W B Bonnor 2001 Class. Quantum Grav. 18 233
Björn Sandstede and Arnd Scheel 2000 Nonlinearity 13 1465
S Ochiai et al 2003 Supercond. Sci. Technol. 16 1071