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Porosity Table 2, Table 2.1 Pronunciation Subdomain (1st level):  Properties Subdomain (2nd level):  Physical properties Grammatical category:  Simple term Grammar notes:  Countable Definition:  Percentage of air space within a sheet of paper. This property is evaluated by determining the air permeability. Definition source:  EN 9 Context:  Porosity is a measure of a paper’s fractional void volume and is not a particularly informative property in itself. Tests that give additional information are air permeability and oil penetration. Context source:  EN 48 Attestation:  2 Co-hyponyms:  Smoothness, Roughness, Dimensional stability, Equilibrium relative humidity, Moisture content, Degree of sizing Hyperonyms:  Physical properties Related terms:  Air permeability It:  Porosità Degree of reliability IT:  3 Fr:  Porosité Degree of reliability FR:  3