Constant change

摘要

Fundamental constants describe a variety of physical properties. Planck's constant, for example, governs the relationship between energy and frequency. The fine-structure constant explains the strength of electromagnetic interaction between charged particles. Fundamental constants such as these underlie the development of much of today's technology, from atomic clocks to GPS. An international community of physicists and metrologists convened at the Workshop on the Determination of the Fundamental Constants in February in Eltville, Germany, to share research into an array of fundamental constants.