Standard Weight (feat. Vsauce) - Periodic Table of Videos

Some amazing artifacts - original standard weights for the pound and troy pound. The troy pound is made from pure platinum!

A correction.. The silicon isotope used is 28, not 29 as stated in the video! Sorry!

The Professor is joined at the Royal Society by none other than Michael from Vsauce - vsauce

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Periodic Videos films are by video journalist Brady Haran

With thanks to the Royal Society: http://royalsociety.org/

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