permeability

noun4

1. •
   The property of being permeable.
2. •
   The rate of flow of a fluid through a porous material.

   • The sulfite cake is usually blended with fly ash (and possibly lime) to produce a landfillable byproduct of low permeability. — 1997
3. •
   A measure of the ability of a rock to transmit fluids (such as oil or water).
4. •
   A quantitative measure of the degree of magnetization of a material in the presence of an applied magnetic field (measured in newtons per ampere squared in SI units).