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BIPM ensemble of mass standards: storage containers
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
BIPM ensemble of mass standards: storage containers
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Linked storage containers made from electropolished stainless steel.
They are kept in a room with stabilized temperature and humidity.
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