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countable and uncountable, plural porosities
(uncountable) The state of being porous. quotations examples
An overfired biscuit has insufficient porosity for glazing.
2004, Frank Hamer with Janet Hamer, The Potter's Dictionary of Materials and Techniques, 5th edition, London, Philadelphia, Penn.: A & C Black; University of Pennsylvania Press, page 248
(countable) A measure of how porous a material is; the ratio of the volume of pores to the total volume examples