
Re: EINSTEINIANA : THE ULTIMATESPEEDLIMIT RED HERRING
Posted:
Aug 1, 2013 4:56 PM


In sci.math message <earle.jones0C430F.16163430072013@news.giganews.com >, Tue, 30 Jul 2013 16:16:34, Earle Jones <earle.jones@comcast.net> posted:
> >The permittivity and permeability of a vacuum are well known. These are >constants. Therefore c (speed of light in a vacuum) is a constant. >
Incorrect. The speed of light, in metres per second, is constant by definition, and it is that definition which determines the length of a metre, the duration of a second being already exactly defined already.
The speed of light is 299 792 458 metres per second. The permeability of vacuum is, by definition, 4 pi 10^7 henries per metre. The permittivity of vacuum is therefore, from the formula given earlier, 8.854 187 817 ... 10^12 farads per metre.
 (c) John Stockton, near London. Mail ?.?.Stockton@physics.org Web <http://www.merlyn.demon.co.uk/>  FAQish topics, acronyms, and links. Correct <= 4line sig. separator as above, a line precisely " " (RFC5536/7) Do not Mail News to me. Before a reply, quote with ">" or "> " (RFC5536/7)

