Re: [Phys-L] the new SI -- ampere, kilogram, kelvin, and mole

["David Marx" <marx@phy.ilstu.edu>]

In the footnotes for the NIST link below, the charge of the electron will be
fixed...

*** The charge of a single electron will be fixed at a value of 1.60217X ×
10-19 ampere-second, where “X” will be specified at the time of the
redefinition. One ampere-second is the same as one coulomb.



> On 08/28/2016 02:22 PM, Chuck Britton wrote:
> > So the New Amp will essentially be an integral number of electronic
> > charges per second?
>
> Maybe a defined constant rational number, maybe an integer.  The
> current plan is to define the elementary charge in terms of the
> coulomb, rather than the other way around.  They haven't chosen
> the constant yet.
>
> The reciprocal of that constant is the number of electrons per
> coulomb ... which might or might not come out to be an integer.
> I hope it does.
>
> Reference:
>   http://www.nist.gov/pml/div684/grp02/counting-down-to-the-new-ampere.cfm
>
> ========
>
> More about the new SI:
>   http://www.bipm.org/en/measurement-units/new-si/
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