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The international prototype
Summary
The international prototype
The international prototype of the kilogram and its six official copies
Stainless-steel one-kilogram standard in its travelling case for a key comparison
Steam cleaning of a 1 kg prototype before a mass comparison
Mettler HK1000MC balance, housed in an air-tight enclosure, used for calibrations
Finding the centre of gravity of a mass standard
Magnetic properties
Heterodyne refractometer used to monitor air density variations
Phase-modulated ellipsometer used to study surface effects on mass standards
Gas storage network
Vacuum network
Related articles
International prototype of the kilogram
The vault housing the prototypes at the BIPM
Stainless-steel one-kilogram standard in its travelling case for a key comparison
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Related articles

International prototype of the kilogram
The vault housing the prototypes at the BIPM
Stainless-steel one-kilogram standard in its travelling case for a key comparison
     
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