ADRIE said:
..the defined length of the standard meter, derived from the wavelenght of
light...it's standardised, cannot change
Craig quipped:
...until the next time it does.
dmb says:
Not that it's relevant to the discussion, but the last time the standard length
of a meter was defined it was my late, great father-in-law was the physicists
who defined it. This also had the effect of redefining the speed of light. They
say this re-definition is very, very precise and that things like GPS wouldn't
work without that high level of accuracy. His name was Kenneth Evenson. After
he died his partner in crime won a Noble Prize. Naturally, we (friends and
family) like to think that he might have won too if he'd lived.
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