GL F IIA2.3 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.
Quantity
Unit
 
 
 
Name
Symbol
Value
Mass
unified atomic mass unit
u
1 u ≈ 1,6605655 x 10-27 kg
Energy
Electronvolt
eV
1eV ≈ 1,6021892 x 10-19 J
The value of these units, expressed in SI units, is not known exactly. 
The prefixes and their symbols listed in F‑II, Annex 2, 1.3 may be used in conjunction with these two units and with their symbols.

Source: http://www.epo.org/law-practice/legal-texts/html/guidelines/e/f_iia2_3.htm

Date retrieved: 17 May 2021

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EPO Guidelines - F The European Patent Application