Praseodymium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about praseodymium, an element used to filter harmful light. Praseodymium has even helped slow light's speed down to a mere 300 meters per second!
As Stephen explained, it's thanks to a praseodymium alloy that chemists can approach the lowest possible temperature. What do we call this temperature, and how many degrees Celsius does it correspond to?
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