Symbol α. The dimensionless constant, with a value of about 1/137, that characterizes quantum electrodynamics. It is given by α=e2/ћc, where e is the charge on an electron, ћ is the Dirac constant, and c is the speed of light in free space.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。