Planck's constant. Planck distribution law. Accessed 11 Nov. More Definitions for Planck's constant. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Log in Sign Up. Planck's constant noun. Save Word. Definition of Planck's constant. First Known Use of Planck's constant , in the meaning defined above. History and Etymology for Planck's constant Max K. The idea, which came to be known as the "electric" or "electronic" kilogram, was widely discussed and finally endorsed in principle by the international General Conference on Weights and Measures CGPM , with a few requirements.
At least three experiments must produce measurements with a relative standard uncertainty of no more than 50 parts per billion, with at least one of those measurements having an uncertainty of no more than 20 parts per billion. All these values must agree within a statistical confidence level of 95 percent.
In mid, the international scientific community rose to the challenge and succeeded in meeting these requirements. Upward of half a dozen Kibble balances are in operation around the world. NIST's final h measurement submitted for the redefined SI had an uncertainty of 13 parts in a billion.
SI Redefinition. Kilogram: Mass and Planck's Constant. Share Facebook. Shisong Li, a guest researcher from Tsinghua University in China, came closest. His prediction differed by only about 5 parts per billion from the measured result. Credit: NIST. Credit: J. Metrology and Metric. As this tweet from NIST explains, the writers of "Stranger Things" slipped up and utilized the value for Planck's constant, rather than the one that would have been available in the summer of , when the episode was set.
Virginia Tech's Fraas lays it all out in this video. Sign up for our Newsletter! Mobile Newsletter banner close.
Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Physics Terms. Planck's constant was devised in by German physicist Dr. Max Planck, who would win the Nobel Prize for his work.
The constant is a crucial part of quantum mechanics, the branch of physics dealing with the tiny particles that make up matter and the forces involved in their interactions.
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