Which Are the Fundamental Universal Constants?

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SUMMARY

The discussion centers on the classification of fundamental universal constants, specifically addressing the distinction between constants that are defined and those that are derived from others. The speed of light (c) is identified as a fundamental constant within the International System of Units (SI), while the permeability of free space (μ0) is described as a mathematical constant. The conversation highlights that constants currently deemed fundamental may change with future updates to the SI system, emphasizing the evolving nature of scientific definitions.

PREREQUISITES
  • Understanding of the International System of Units (SI)
  • Familiarity with physical constants such as speed of light (c) and permeability of free space (μ0)
  • Basic knowledge of electromagnetism and its principles
  • Awareness of the implications of unit systems on scientific measurements
NEXT STEPS
  • Research the implications of the upcoming SI unit updates on physical constants
  • Explore the relationship between ε0 (electric permittivity) and μ0 (magnetic permeability)
  • Study the historical context and evolution of fundamental constants in physics
  • Investigate the role of defined versus derived constants in scientific calculations
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Physicists, educators, and students interested in the foundations of physical science and the implications of unit systems on the understanding of universal constants.

w.shockley
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Which are the Fundamental Universal Costants?
With "Fundamental" i mean the ones that are not obtainable from others:
for example, the light speed c is not fundamental, because is 1/sqrt(epsilon0 mu0)...
 
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It depends on which system of units you are using.
Some of the constants that are now fundamental will probably NOT be fundamental and vice versa once the SI is updated in a few years time.
And c IS fundamental in the SI, whereas epsilon_0 is not.
 
Hi w.shockley! Welcome to PF! :smile:

Actually, all the constants you mention have defined values nowadays.
μ0 has always been a mathematical constant (afaik).
c has been defined as a specific constant.
And in turn ε0 has become a defined constant as well.

For more information, see for instance: http://en.wikipedia.org/wiki/Physical_constant
 

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