Mass and Moles

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Episode 2 of 3

Duration: 1 hour

Deep underground in a vault beneath Paris lives the most important lump of metal in the world - Le Grand K. Created in the 19th century, it's the world's master kilogramme, the weight on which every other weight is based. But there is a problem with Le Grand K - it is losing weight. Professor Marcus du Sautoy explores the history of this strange object and the astonishing modern day race to replace it.

Credits

Presenter
Marcus du Sautoy
Director
Mike Cunliffe
Producer
Mark Woodward

Broadcasts

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