Nonpermeable

Full definition of nonpermeable

Adjective

1. Not permeable.
2. (physics) Having the same magnetic permeability as that of free space, so that the material in question has a magnetic permeability $\backslash mu\; =\; \backslash mu\_0$ (where μ

0 = 4π×10⁻⁷ N A⁻² exactly in SI units).