Game over for the original kilogram | News

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A chart relating standard measurements to the physical constants on which they are based

Chart showing change in mass of official copies of the kilogram

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International prototype of the kilogram

Le grand k — the original kilogram weight against which all others are calibrated. Here it is safe under its protective bell jars that are meant to prevent any physical or chemical changes to the platinum-iridium cylinder, but it is likely that its mass has been changing over time

Source: © BIPM

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