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当一些物理学家向物理常数测量不断提高精确性进军时,另一些物理学家正在考虑为最基本的常数之一——光速确立一个固定值。虽然你也许永远不会注意其中的差别。《物理评论通讯》最近的报道中描述了牛顿万有引力常数及精细结构常数的新测量。在华盛顿国家标准局工作的卢瑟(G.Luther)及弗吉尼亚大学的托勒(W.Towler)测量出G为(6.6726±0.0005)×10~(-11)米~3/秒~2/公斤。他们说该测量结果是近四十年来国际公认值(6.6720±0.0041)×10~(11)米~3/秒~2公斤的首次改进。新泽西州默里山贝尔实验室的崔(D.C.Tsui)、戈沙德(A.C.Gossard)和华盛顿国家标准局来的三位同事测出无量纲精细结构常数的倒数值为
While some physicists march toward ever increasing accuracy in the measurement of physical constants, other physicists are considering establishing a fixed value for one of the most fundamental constants, the speed of light. Although you may never notice the difference. Recent reports in Physical Review Newsletter describe new measurements of Newton’s gravitational constant and fine structure constant. G was (6.6726 ± 0.0005) × 10 ~ (-11) m ~ 3 / s ~ 2 / kg as measured by G. Luther, working at Washington National Bureau of Standards, and W. Towler at the University of Virginia. . They said the measurement was the first improvement in the internationally recognized value of 6.6720 ± 0.0041 × 10-11 m -3 / s ~ 2 kg over the past 40 years. Three colleagues from Washington D.C. Tsui, A.C. Gossard and the Washington National Bureau of Standards in Murray Hill, New Jersey, measured reciprocal values of the dimensionless fine structure constants as