Porosity or void fraction is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%.
Wikipedia
Ratio of void volume and total volume of a porous material
Wikidata
A measure of how porous a material is; the ratio of the volume of pores to the total volume.
Wiktionary
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