Here it is - five grams of caesium in water... But did you know caesium (aka cesium) is also used to define the length of a second? For extra footage and replays of the reaction visit http://www.youtube.com/watch?v=pWXQ2tYzJaU More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos Periodic Videos films are by video journalist Brady Haran
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