Published On Nov 17, 2011
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
More chemistry at http://www.periodicvideos.com/
Follow us on Facebook at / periodicvideos
And on Twitter at / periodicvideos
Periodic Videos films are by video journalist Brady Haran
With thanks to the Royal Society: http://royalsociety.org/
show more