# Absolute permittivity and permeability of free space

We define the wave equation using two constants: $\epsilon_0$ and $\mu_0$. Of course they are absolute permittivity and absolute permeability of free space. I've read they have capacitive and inductive properties, I want to know how do we describe it physically?
• Notice that $c = 1/\sqrt{\varepsilon_0 \mu_0}$. Therefore, the speed of light depends on those parameters. If the vacuum would have infinite capacity and zero inductivity, light would propagate infinitely fast, I'd say. This is just a thought, not a proper answer, though. – Martin Ueding Feb 20 '14 at 15:17