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the meter is defined to be the distance light travels in avacuum in a
certain number seconds
OK
Philosophically, (logically and perhaps operationally) is this a good
definition?
Logically and operationally, yes.
Philosophically, it depends on one's philosophy, Horatio.
This requires a definition of the vacuum.
OK
Is there only one vacuum?
Logically and operationally, the requirement is that you and
I need to be
able to set up the speed-of-light experiment (i.e. the
meter-stick-calibration experiment) and agree on the
results. Operationally, it is not particularly hard to do this.
Is the speed of light in the vacuum between two infinite parallelother vacuums?
conducting sheets (casimir, effect) different than for