Fundamental Universal Costants

  • Thread starter w.shockley
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  • #1
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Main Question or Discussion Point

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)...
 

Answers and Replies

  • #2
f95toli
Science Advisor
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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.
 
  • #3
I like Serena
Homework Helper
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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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