Measuring Mass: The Last Artefact
BBC FOUR
Wednesday 15 September 2021 21:00 - 22:00 (60 mins)
A piece of metal that defines the mass of a kilogramme has, over time, lost the equivalent of the weight of an eyelash. What are the consequences for how we measure our world? Also in HD. [S]
Measuring Mass: The Last Artefact may be available on playback
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