porosity

This term describes the physical property of a material containing small holes or voids. It is most frequently employed in technical fields such as geology, materials science, and medicine to describe how a substance allows liquids or gases to pass through its structure.

As an uncountable noun, it refers to a general quality or a specific measurement. It does not have a plural form in standard usage; instead, one would refer to the porosity of multiple samples rather than using a pluralized version of the word.