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Caesium or Cesium - Periodic Table of Videos

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Uploaded by on Aug 10, 2009

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

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Periodic Videos films are by video journalist Brady Haran

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Science & Technology

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Top Comments

  • fancy erection, nice neil

  • why that is Einstein jr!

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  • i thought mercury was the only metal that was liquid at normal temps?

  • brits you gotta love em

  • I want that clock!!!

  • THANK YOU FOR EXPLAINING THE CHEMISTRY AT THE END

    I was thinking about it, when the guy said "Cesium loses its electron and becomes Cesium +" I was wondering what exactly happens to the water, and whether H+ and/or OH- become present... I couldnt figure it out, and then you explained it :) Awesome

  • I want that clock

  • 4:20 uhuhuhuhuhuh

  • Okay, I'm so immature, but "Neil's device - a very very fancy erection." made me laugh.

  • I did a rough calculation and it seems to me that 5 gram caesium will produce only about 1.7 liters of hydrogen (at normal pressure and temperature). This might explain the smallish explosion.

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