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Division 3 UNITS USED WITH THE SI, WHOSE VALUES IN SI ARE OBTAINED EXPERIMENTALLYX1F1

United Kingdom

Original text. Later amendments are not shown.

Quantity Unit
Name Symbol Definition
Energy Electronvolt eV The electron volt is the kinetic energy acquired by an electron in passing through a potential difference of 1 volt in vaccum
Mass Unified atomic mass unit u The unified atomic mass units is equal to 1/12 of the mass of an atom of the nuclide 12 C.
  1. Note:

Annotations

Textual amendments

F1

Substituted by Directive 1999/103/EC of the European Parliament and of the Council of 24 January 2000 amending Council Directive 80/181/EEC on the approximation of the laws of the Member States relating to units of measurement.

Editorial notes

X1

Substituted by Corrigendum to Council Directive 80/181/EEC of 20 December 1979 on the aproximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (Official Journal of the European Communities No L 39 of 15 February 1980).