Learn how to say Porousness correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word porous:
(of a rock or other material) having minute interstices through which liquid or air may pass:
layers of porous limestones
some rocks are more porous than others
not retentive or secure:
he ran through a porous home defence to score easily
late Middle English: from Old French poreux, based on Latin porus ‘pore’