The strength of this force is defined by the constant of proportionality G, which is called the gravitational constant. This equation describes the attractive force between the two masses M and m separated by the distance r. In this paper we briefly review the history of the G measurement, and introduce eleven values of G adopted in CODATA 2014 after 2000 and our latest two values published in 2018 using two independent methods. This uncertainty is the smallest compared with previous CODATA recommended values of G however, it remains a relatively large uncertainty among other fundamental physical constants. Over the past two decades, eleven precision measurements of the gravitational constant have been performed, and the latest recommended value for G published by the Committee on Data for Science and Technology (CODATA) is (6.674 08 ± 0.000 31) × 10 −11 m 3 kg −1 s −2 with a relative uncertainty of 47 parts per million. Although G was the first physical constant to be introduced in the history of science, it is considered to be one of the most difficult to measure accurately so far. The Newtonian gravitational constant G, which is one of the most important fundamental physical constants in nature, plays a significant role in the fields of theoretical physics, geophysics, astrophysics and astronomy.
0 Comments
Leave a Reply. |