penetrable; allowing passage through; often used to describe surfaces.
Merriam-Webster Online Dictionary
pervious (adjective)1.
- accessible pervious to reason
2.
- permeable pervious soil
pervious (Wikipedia)
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Permeability in fluid mechanics and the earth sciences (commonly symbolized as k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it.
The permeability of a medium is related to the porosity, but also to the shapes of the pores in the medium and their level of connectedness.