porosity
n. uncountable C1 Advanced UK //pɔːɹˈɒsɪti// poros·i·ty
n. the amount of small holes or spaces in a material. These holes can let air, water, or other liquids pass through.
n. the quality or state of being porous; the presence of numerous small openings or interstices in a substance. Often measured as the ratio of void volume to total volume.
The high porosity of the soil allows water to drain quickly.
Engineers must account for the porosity of the concrete when designing structures that will be exposed to heavy rain.
The unique porosity of the volcanic rock allows it to act as a natural filter, removing impurities from groundwater as it passes through the layers.
From porous + -ity.