For nearly 130 years, the kilogram has been defined by a small platinum and iridium cylinder sitting in a vault outside Paris. Every other unit of measurement is defined by reproducible physical ...
The latest “Google Doodle” on the homepage of Google celebrates advances in quantum physics to spark wider public curiosity about the field. The April 14, 2026 illustration highlights the Bloch sphere ...
(Phys.org) —After two years of difficult and meticulous work examining, refurbishing, and testing the aging workhorse watt balance called NIST-3, PML researchers have used the instrument to obtain ...
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What is Planck's constant?
Planck's constant is one of the most important numbers in all of physics. It is, essentially, the ultimate guide to the quantum world. It tells us where quantum effects are important, the fundamental ...
Scientists and policy makers from around 60 nations voted unanimously Friday to redefine the kilogram. The decision at the General Conference on Weights and Measures in Versailles, France was greeted ...
The kilogram — anywhere in the world, for any purpose — is based on the exact weight of a golf-ball-sized chunk of platinum and iridium stored under three glass bell jars in a vault in an ornate ...
Physicists in the US say that they have used publicly available data from global positioning system (GPS) satellites to put a limit on how much Planck’s constant might vary from place to place. Their ...
Researchers at the National Institute of Standards and Technology (NIST) have made their most precise determination yet of Planck’s constant. This will let NIST redefine the kilogram, the official ...
What is it to be quantum? We hear the word often enough: quantum mechanics, quantum teleportation, quantum entanglement, quantum computing, quantum encryption, etc. Rarely, it seems, do we consider ...
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