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The only standard unit that has a physical presence is the unit if mass. The Kilogram. It is kept in Paris.

The metre was originally a length of bar also kept in Paris, this, as a standard, has now been superseded though the bar still exists.

add Currently work is under way to manufacture almost perfectly spherical spheres (made of Silicon I think?) and the number of atoms of Si in these spheres will be known to a high degree of precision.

Many standards laboratories still have physical blobs of length and mass for convenience in transferring the Standards to Industry.

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14y ago

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