![]() This report gives a detailed account of the 2018 least-squares adjustment of over 300 recommended values of basic fundamental constants in nature based on the latest relevant precision measurements and improvements of theoretical calculations. The proton charge radius puzzle has been partially resolved by improved measurements of hydrogen energy levels. Inconsistencies remain for the gravitational constant and the muon magnetic-moment anomaly. Further, because the elementary charge, Boltzmann constant, and Avogadro constant also have exact values in the revised SI, many other constants are either exact or have significantly reduced uncertainties. The former include a decrease in the uncertainty of the dimensionless fine-structure constant and a nearly two orders of magnitude improvement of particle masses expressed in units of kg due to the transition to the revised International System of Units (SI) with an exact value for the Planck constant. ![]() A discussion of the major improvements as well as inconsistencies within the data is given. The values are based on a least-squares adjustment that takes into account all theoretical and experimental data available through 31 December 2018. The recommended values can also be found at /constants. ![]() We report the 2018 self-consistent values of constants and conversion factors of physics and chemistry recommended by the Committee on Data of the International Science Council.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |