Traditionally, determining an object's porosity would require destructive testing.
From the en.wikipedia.org
The higher the porosity, the better a site will be for drinking water or oil wells.
From the dispatch.com
This parameter can be used as an indirect surrogate measure of bone porosity.
From the nature.com
For example clay minerals tend to fill up pore space and thereby reducing porosity.
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Unlike the Folk scheme, Dunham deals with the original porosity of the rock.
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Porosity logs measure the fraction or percentage of pore volume in a volume of rock.
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Converted-wave analysis is also used to determine subsurface lithology and porosity.
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Since 1999, MOFs have held the record for having the highest porosity of any material.
From the sciencedaily.com
Geologists often look for porosity, or how well fluids pass through rocks.
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More examples
The property of being porous; being able to absorb fluids
(porous) full of pores or vessels or holes
(porous) holey: allowing passage in and out; "our unfenced and largely unpoliced border inevitably has been very porous"
Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%. Strictly speaking, some tests measure the "accessible void," the total amount of void space accessible from the surface (cf. closed-cell foam)...
The state of being porous; A measure of how porous a material is; the ratio of the volume of pores to the total volume
(porous) Full of tiny pores that allow fluids or gasses to pass through; : full of loopholes; With many gaps
(porous) Having a granular surface as the result of oxidation.
(porous) A description indicating a rough or granular surface, typically seen on pre-1816 copper coins.
(porous) something which allows water to pass through it. Compare nonporous.