The article outlines the official redefinition of the kilogram, a quantum-based measurement standard that replaces a physical metal artifact with a fixed value of Planck’s constant. Guided by the International Bureau of Weights and Measures (BIPM), this protocol is fully implemented as of World Metrology Day. National institutions like Canada’s NRC have deployed highly precise Kibble balances to apply the new definition, while organizations such as the U.S. NIST and independent researchers are developing simplified versions for broader use. The standard is already active, with ongoing rollout across research labs, industry, and educational projects to replace an aging prototype that historically drifted over more than a century.
This shift ensures permanent stability for mass measurements and improves accuracy for related units like the ampere and mole. By anchoring measurement to unchanging natural constants instead of fragile objects, the system eliminates historical inconsistencies and allows anyone with appropriate tools to calibrate their own equipment. Technically, mass is now determined by balancing gravitational force against electromagnetic force using highly accurate electrical standards. While elite laboratories achieve extreme precision with advanced quantum references, accessible DIY setups prove the core principles work at much lower costs. The change is already in effect, making high-precision measurement more reliable and widely available without requiring specialized facilities.
Source: https://www.astm.org/news/esp/la-nueva-definicion-del-kilogramo-ja19
Keywords: Planck constant, Kibble balance, SI redefinition
