Assertion: porosity | /r/HasProperty | measured as the rate of the passage of air
Facets:
value: through a sample
type: OTHER
value: quantitatively
type: MANNER
Source sentences:
text: Porosity of paper is measured quantitatively as either the length of time it takes for a quantity of air to pass through a paper sample, or the rate of the passage of air through a sample, using either a Gurley densometer (in the first case) or a Sheffield porosimeter (in the second case).