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porous - Wiktionary, the free dictionary porous (comparative more porous, superlative most porous) Sponges are porous so they can filter water while trapping food Concrete is porous, so water will slowly filter through it
Porosity - Wikipedia Porosity or void fraction is a measure of the void (i e "empty") 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% Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf closed-cell foam) There are many ways to test porosity in a