nonpermeable

English

Etymology

non- +‎ permeable

Adjective

nonpermeable (not comparable)

1. Synonym of impermeable.
2. (physics) Having the same magnetic permeability as that of free space, so that the material in question has a magnetic permeability $\mu =\mu _{0}$ (where μ₀ = 4π×10⁻⁷ N A⁻² exactly in SI units).