Demise of the Kilogram – Sixty Symbols04:33

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Published on February 9, 2017

The days of a “fixed” kilogram seem to be numbered, with moves afoot to set our SI unites based on fundamental constants.
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Standard weights:
Replica of the Parisian kilogram:
Derek holds a kilo-ball:

This video features Professor Michael Merrifield:

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Sixty Symbols videos by Brady Haran

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