scholarly journals Measurable values, numbers and fundamental physical constants: Is the Boltzmann constant Kb a fundamental physical constant?

2009 ◽  
Vol 13 (4) ◽  
pp. 253-258 ◽  
Author(s):  
Edward Bormashenko ◽  
Avigdor Sheshnev
Keyword(s):  
Physical Constant ◽  
Frames Of Reference ◽  
Fundamental Physical Constant ◽  
Boltzmann Constant ◽  
Fundamental Physical Constants ◽  
Physical Constants ◽  
System Of Units ◽  
The Status ◽  
Definition Of ◽  
Fundamental Physical

The status of fundamental physical constants is discussed. The nature of fundamental physical constants is cleared up, based on the analysis of the Boltzmann constant. A new definition of measurable values, 'mathematical' and 'physical' numbers and fundamental physical constants is proposed. Mathematical numbers are defined as values insensitive to the choice of both units and frames of reference, whereas 'physical numbers' are dimensionless values, insensitive to transformations of units and sensitive to the transformations of the frames of reference. Fundamental constants are classified as values sensitive to transformations of the units and insensitive to transformations of the frames of reference. It is supposed that a fundamental physical constant necessarily allows diminishing the number of independent etalons in a system of units.

scholarly journals Definition of the mole (IUPAC Recommendation 2017)

2018 ◽  
Vol 90 (1) ◽  
pp. 175-180 ◽  
Author(s):  
Roberto Marquardt ◽  
Juris Meija ◽  
Zoltán Mester ◽  
Marcy Towns ◽  
Ron Weir ◽  
...  
Keyword(s):  
International System ◽  
International Committee ◽  
Fundamental Physical Constants ◽  
Weights And Measures ◽  
Technical Report ◽  
System Of Units ◽  
Iupac Recommendation ◽  
Definition Of ◽  
Base Units ◽  
Fundamental Physical

AbstractIn 2011 the General Conference on Weights and Measures (CGPM) noted the intention of the International Committee for Weights and Measures (CIPM) to revise the entire International System of Units (SI) by linking all seven base units to seven fundamental physical constants. Of particular interest to chemists, new definitions for the kilogram and the mole have been proposed. A recent IUPAC Technical Report discussed these new definitions in relation to immediate consequences for the chemical community. This IUPAC Recommendation on the preferred definition of the mole follows from this Technical Report. It supports a definition of the mole based on a specified number of elementary entities, in contrast to the present 1971 definition.

scholarly journals Why is G the Least Precisely Known Physical Constant?

1987 ◽  
Vol 42 (7) ◽  
pp. 663-669 ◽  
Author(s):  
C. C. Speake ◽  
G.T. Gillies
Keyword(s):  
Physical Constant ◽  
The Other ◽  
Fundamental Physical Constants ◽  
Relative Precision ◽  
Ground Movements ◽  
Physical Constants ◽  
Newtonian Constant ◽  
Fundamental Physical

CODATA has recently published its readjustment of the fundamental physical constants and assigns a relative precision of 128 x 10-6 to G, the Newtonian constant of gravitation. Given that most of the other constants in physics have relative precisions of ~10-6 or better, we examine the reasons why the value for G remains so imprecise: The role of G in physics in general is considered and the most recent experimental determinations are examined. Constraints are given for perturbing effects in G measurements and a key result is that horizontal ground movements must be taken more carefully into account in future more precise terrestrial experiments.

scholarly journals Precision measurement of the Newtonian gravitational constant

2020 ◽  
Vol 7 (12) ◽  
pp. 1803-1817
Author(s):  
Chao Xue ◽  
Jian-Ping Liu ◽  
Qing Li ◽  
Jun-Fei Wu ◽  
Shan-Qing Yang ◽  
...  
Keyword(s):  
Gravitational Constant ◽  
Physical Constant ◽  
Theoretical Physics ◽  
Fundamental Physical Constants ◽  
Large Uncertainty ◽  
Physical Constants ◽  
The Past ◽  
History Of ◽  
Fundamental Physical ◽  
Newtonian Gravitational Constant

Abstract 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. 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. 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 m3 kg−1 s−2 with a relative uncertainty of 47 parts per million. 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. 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.

Values of the fundamental physical constants according to agreements in 1969

1970 ◽  
Vol 13 (8) ◽  
pp. 1124-1130 ◽  
Author(s):  
S. V. Gorbatsevich ◽  
V. M. Holin ◽  
V. N. Nosal'
Keyword(s):  
Fundamental Physical Constants ◽  
Physical Constants ◽  
Fundamental Physical
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