Breaking two ampoules of Potassium underwater. See our previous sodium video: https://youtu.be/IaP3lGfa2n0 Caesium next: https://youtu.be/b2YrZNahqiw Alkali Metal playlist: http://bit.ly/Alkali_Metals Music: Alan Stewart Choose your element - Periodic Videos on Patreon: https://www.patreon.com/periodicvideos 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 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.bradyharan.com/ Brady's Blog: http://www.bradyharanblog.com Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9