How should µeV be written out? Is it microelectronvolts? or microelectron-volts?

  • 1
    Depends on the context.
    – Hot Licks
    Nov 17 '20 at 12:09
  • 1
    Wikipedia allows "electron volt", "electron-volt" or "electronvolt" for the base form; it's usual to put SI prefixes on without any hyphen. But in the absence of a house style, you can probably do what looks natural ("microelectronvolt" seems fine if you really can't use the symbol). See english.stackexchange.com/questions/208679/…
    – Stuart F
    Nov 17 '20 at 16:45

The Guide for the Use of the International System of Units (SI) from NIST on https://physics.nist.gov/cuu/pdf/sp811.pdf is useful for this.

In section 6.2.8 a relevant example is presented:

Examples of the use of prefix symbols with eV and u are 80 MeV (80 megaelectronvolts) and 15 nu (15 nanounified atomic mass units).



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