[time-nuts] 15 ns vs. 15 nS

Jean-Louis Oneto Jean-Louis.Oneto at obs-azur.fr
Tue May 22 08:17:00 EDT 2007


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
----- Original Message ----- 
From: "John Day" <johnday at wordsnimages.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Tuesday, May 22, 2007 11:42 AM
Subject: Re: [time-nuts] 15 ns vs. 15 nS


> At 04:05 AM 5/22/2007, Rob Kimberley wrote:
>>As Seconds are a fundamental unit of the SI system, shouldn't the "S" be
>>upper case?
>
> Of seven SI 'base units' only two - K for thermodynamic temperature
> and A for electrical current are capitalised. On the basis of your
> suggestion we would need to campaign for a change in 5 units, not just 
> one.
>
> John
>





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