OT: Speed of light

[Dotan Cohen]

On 14/02/2008, Erik Max Francis <max at alcyone.com> wrote:
> Bjoern Schliessmann wrote:
>
>  > eV has a advantages some "kilogram force" hasn't: It's on completely
>  > different order of magnitude. People aren't happy writing 81.8 aJ
>  > (Attojoule = 1e-15 Joule), instead they prefer
>  > 511 keV.
>
>
> A couple of problems here.  1 eV = 1.602 x 10^-19 J.  Also, the atto-
>  prefix is 10^-18, not 10^-15.  So 511 keV = 81.9 fJ (femtojoules).  (All
>  values to three significant figures.)
>
>  If you want to deal with a unit on the order of the size of the
>  electron-volt, then you have to one rung down from even atto-, which is
>  (wait for it) zepto-.  The electron-volt is about 160 zJ (zeptojoules).
>

Thanks, my IQ just went up one zeptopoint.

Dotan Cohen

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A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?