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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
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
porous - WordReference. com Dictionary of English porous ˈpɔːrəs adj permeable to water, air, or other fluids having pores; poriferous easy to cross or penetrate: the porous border into Thailand, the most porous defence in the league Etymology: 14th Century: from Medieval Latin porōsus, from Late Latin porus pore2 ˈporously adv ˈporousness n