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BNC: 17995 COCA: 32912
porosity
noun

or void fraction

  1. From our crowdsourced Open Dictionary
    a measure of the void spaces in a material. It is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%.Submitted by Hemen from Belgium on 22/05/2017

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