Which Are the Fundamental Universal Constants?

AI Thread Summary
The discussion focuses on identifying fundamental universal constants, emphasizing that some constants, like the speed of light (c), are considered fundamental within specific systems of units, such as the SI system. It is noted that constants currently deemed fundamental may change with future updates to the SI. Participants clarify that constants like permeability (μ0) and permittivity (ε0) have defined values in modern physics. The conversation highlights the evolving nature of these constants and their definitions. Understanding these distinctions is crucial for grasping the foundations of physical laws.
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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