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A one-tonne (1000-kilogram) concrete block
A one-tonne (1000-kilogram) concrete block
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A series of 5, 2, 1, 0.5 and 0.2 kilogram weights, made out of rusty cast iron
A series of 5, 2, 1, 0.5 and 0.2 kilogram weights, made out of rusty cast iron
The International Prototype of the Kilogram, whose mass was defined to be one kilogram from 1889 to 2019.
The International Prototype of the Kilogram, whose mass was defined to be one kilogram from 1889 to 2019.
A Kibble balance, which was originally used to measure the Planck constant in terms of the IPK, can now be used to calibrate secondary standard weight
A Kibble balance, which was originally used to measure the Planck constant in terms of the IPK, can now be used to calibrate secondary standard weights for practical use.