3. — Council Directive 80/181/EEC of 20 December 1979 on the approximation of the…

3.

Council Directive 80/181/EEC of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC · European Union

UNITS DEFINED INDEPENDENTLY OF THE SEVEN SI BASE UNITS The unified atomic mass unit is one-twelfth of the mass of an atom of the nuclide 12C. The electronvolt is the kinetic energy acquired by an electron passing in a vacuum from one point to another whose potential is one volt higher. >PIC FILE= "T0013337"> The value of these units, expressed in SI units, is not known exactly. The above values are taken from CODATA Bulletin No 11 of December 1973 of the International Council of Scientific Unions. Note : The prefixes and their symbols listed in 1.3 may be used in conjunction with these two units and with their symbols.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-06 · Text as adopted (Official Journal); later amendments are not incorporated in this text.