Guidelines for Examination - Table of Contents   PART C GUIDELINES FOR SUBSTANTIVE EXAMINATION   CHAPTER II CONTENT OF A EUROPEAN PATENT APPLICATION (OTHER THAN CLAIMS)   CHAPTER II Annex UNITS RECOGNISED IN INTERNATIONAL PRACTICE AND COMPLYING WITH RULE 49(11) (see II,...       3. Units used with the SI, and whose values in SI are obtained experimentally

The unified atomic mass unit is 1/12 of the mass of an atom of the nuclide 12C.

The electronvolt is the kinetic energy acquired by an electron passing through a potential difference of 1 volt in a vacuum.

The value of these units, expressed in SI units, is not known exactly.

The prefixes and their symbols listed in 1.3 may be used in conjunction with these two units and with their symbols.