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the meter is defined to be the distance light travels in a vacuum in a
certain number seconds
Philosophically, (logically and perhaps operationally) is this a good
definition?
This requires a definition of the vacuum.
Is there only one vacuum?
Is the speed of light in the vacuum between two infinite parallel
conducting sheets (casimir, effect) different than for other vacuums?
If vacuum polarization effects affect this, then can we
assign a non-unity index of fraction to certain vacuums?
(in a somewhat analogous fashion to how some folks assign an impedance to
the vacuum).