Re: c = inverse(sqrt(epsilon nought *mu nought))

In article <1179703684.134338.96080@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Wade Ward <zaxfuuq@xxxxxxxxx> wrote:

With MM posting a value for c at tens of thousands of meters per
second less than 3 x 10**8, this forces either
C =(E0*U0)**(-.5) to be an approximation or
E0=(1E-9)/(36*PIE)
U0=(1E-7)*4*PIE are approximations.

Not quite. You don't say what units you are using, but in SI units
both C and U0 above are both exact, E0 is an approximation.

The SI definitions give the units of U0 as N/A**2 = kg m s**(-2) A**(-2),
C as m/s, E0 as F/m = kg**(-1) m**(-3) s**4 A**2.
(If you invent suitable derived types you can even make Fortran do
your units as well as your numbers)

See, for example, http://www.physicstoday.org/guide/fundcon.html

-- John Harper, School of Mathematics, Statistics and Computer Science,
Victoria University, PO Box 600, Wellington 6140, New Zealand
e-mail john.harper@xxxxxxxxx phone (+64)(4)463 5341 fax (+64)(4)463 5045
.

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