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?
More links in description below ↓↓↓

For extra footage and replays of the reaction visit    • Caesium in Water (multiple cameras)  

Support Periodic Videos on Patreon:   / periodicvideos  

A video on every element: http://bit.ly/118elements

More at http://www.periodicvideos.com/
Follow us on Facebook at   / periodicvideos  
And on Twitter at   / periodicvideos  
From the School of Chemistry at The University of Nottingham: http://bit.ly/NottChem

Periodic Videos films are by video journalist Brady Haran: http://www.bradyharanblog.com

Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9