Does the use the use of ε0 imply that it is for vacuum?

[ugenetic]

I found most literatures on Electrical or Magnetic fluxes maddeningly unclear about the MATERIAL in which the equations are applied. In free air only? or not?

I would like to know if the following 2 statements are true
the electrical flux generated by a single charge will look the same in all (uniform) materials.
the electrical field E generated by a single charge will change from one material to another depends on εr.

I m guessing maxwell equations are really for conductors and air?

 

[Simon Bridge]

$\epsilon_0$ is for a vacuum. It is often used as an approximation in air since the relative permativity of air is very nearly 1.

You should be able to tell whether a vacuum is intended or not by the context.

Maxwels equations are for everywhere.
Some people just write them out for the vacuum case.

 

[NascentOxygen]

In a formula, ε_o is always accompanied by ε_r.

Similarly, μ_o is always accompanied by μ_r.

If the relative constant is not explicitly shown, it is taken as unity (meaning its value in free space).

 

[Baluncore]

The electric flux distribution will be the same for anyone isotropic material only if the boundary conditions are perfect conductors and/or insulators, and the geometry is fixed.

 

[ugenetic]

OH WOW, so clear, thank you all. I am writing them down.