| http://www.w3.org/ns/prov#value | - The openings through which the water passes can take any form such as relatively large pores dispersed throughout the structure, which are at least about 0.5 micrometers in average diameter, or through channels which can take any shape, such as slits, or the openings can be a multitude of cells having porous walls, such as in a honeycomb structure.
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