In the Philosophical Investigations §50, Wittgenstein writes: There is one thing of which one can say neither that it is one metre long, nor that it is not one metre long, and that is the standard metre in Paris.
Deputy Director of the National Institute of Standards and Technology.
Copies of the Spanish standard were made for Egypt, France and Germany.
Most people will have a credit card or bank card on them.
Regarding the precision of the conversion from the to the metre, both were then defined by primary , and unique artifacts made of different with distinct coefficients of were the legal basis of units of length.
Namely, the French committee chose the platinum bar which was accidentally closest to the length computed by the surveyors.