How We're Redefining the kg
by Super User, 3 years ago
Try a free book from Audible for 30 days http://ve42.co/audible
Special thanks to the staff at NIST who made this possible: Darine Haddad, Jon Pratt, Stephan Schlamminger, and Ben Stein.
Additional footage and animations by Sean Kelley, Jennifer Lauren Lee, and Frank Seifert.
I have been obsessed with measurement for a long time and I'm not sure quite how it happened. The world's roundest object played a role in this. I guess I'm just fascinated by how difficult it is to pin down a quantity like a kilogram. A physical object seemed like a good idea until the mass of the international prototype kilogram wasn't as constant as expected. These methods of the Kibble balance and silicon sphere have shown better precision than 20 parts per billion, making them superior to the old method. The agreement between Avogadro approaches
Special thanks to Patreon Supporters:
Tony Fadell, Donal Botkin, Jeff Straathof, Zach Mueller, Ron Neal, Nathan Hansen
Support Veritasium on Patreon: http://ve42.co/patreon
Interferometer video by TSG Physics: https://www.youtube.com/watch?v=j-u3IEgcTiQ
Music from http://epidemicsound.com "ExperiMental1" by Gunnar Johnsén
Studio filming by Raquel Nuno