THIS DAY IN SCIENCE: Last Space Shuttle mission launched (Atlantis) in 2011

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How We’re Redefining the kg

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

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Interferometer video by TSG Physics: https://www.youtube.com/watch?v=j-u3I…

Music from http://epidemicsound.com “ExperiMental1” by Gunnar Johnsén

Studio filming by Raquel Nuno

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