# Vacuum permittivity as a fundemental dimensioned unit

1. Sep 23, 2011

### Phrak

As the usual argument goes, as I understand it, everything can be expressed in units of G, h and c. (though this argument exclude the particle masses from consideration.)

The permittivity of the vacuum seems to be independent of G,h,c. Am I wrong?

2. Sep 23, 2011

### clem

epsilonzero is directly related to c.

3. Sep 23, 2011

### Phrak

Yes, thank you. One combination of c and epsilon yields permeability.

I was thinking of rephrasing, to ask if permeability and/or permittivity could be expressed in c,G,h, but the question is equivalent since mu nu c^2 = 1. The question is equal to asking about permeability.

Last edited: Sep 23, 2011
4. Sep 23, 2011

### clem

muzero in SI is not a measured constant. It is arbitrarily defined as 4piX10^-7.