The article discusses the upcoming redefinition of the International System of Units (SI) by the General Conference on Weights and Measures on November 16, 2018. The new definition will be based on fixed numerical values of seven fundamental constants of physics, including the Planck constant and the speed of light. This change will modernize the SI and make it more stable and universal.
The article features Jon R. Pratt, Chief of the Quantum Measurements Division at NIST, who has been involved in the effort to redefine the kilogram for over 30 years. The division has been working on measuring the Planck constant and proving that the kilogram can be based on fundamental constants, rather than a physical object.
The article includes photos of NIST researchers taken 30 years apart, showing the progress made in the project. It also mentions that the new definition of the kilogram will be celebrated on November 16, the day before Pratt’s 57th birthday.
The redefinition of the SI units is expected to have a significant impact on various fields, including science, technology, and international trade. It will provide a more accurate and reliable measurement system based on universal constants.
Keywords: Système International d’Unités, Planck constant, Fundamental constants
