[time-nuts] 15 ns vs. 15 nS

[James Maynard]

Jean-Louis Oneto wrote:
> Hi,
> the rule is that only unit names derived from people's name are capitalized, 
> hence Volt, Hertz, Siemens, Kelvin, Ampere, Joule, Coulomb, Farad, Watt...
> The complete list can be found at:
> http://www.bipm.org/en/si/si_brochure/chapter2/2-2/table3.html (english 
> version)
> Have a nice day,
> Jean-Louis Oneto
> OCA GEMINI - Avenue Copernic - 06130 Grasse - France
>   
Actually, the rule is slightly different. To quote the English version 
of the BIPM's SI brochure, section 5.2, "SI unit symbols" :

In general, unit symbols are written in lower case, but if the name of 
the unit is derived from the proper name of a person, the first letter 
of thesymbol is a capital. Whenthe name of a unit is spelled out, it is 
always in lower case, except when the name is the first word of a 
sentence or is the name "degree Celsius".

Ou, en français:

En général les symboles des unités sont ecrits en minuscules, mais, si 
le nom de l'unité dérive d'un nom propre, la première lettre du symbole 
est majuscule. Le nom de l'unitè proprement dit commence toujours par 
une minuscule, sauf s'il agit du premier mot d'un phrase our du nom 
«degré Celsius».