The phrase "porous nature" refers to something that has small holes or gaps which allow substances or elements to pass through, like a sponge. Full definition
Results: They found zeolites's porous nature makes it a great chemical catalyst, but also traps tiny clusters of carbon - containing molecules that can ultimately disrupt the catalysis process. (pnnl.gov)
If the porous nature of the northern border doesn't threaten our sovereignty, then why should similar openness threaten us on the southern border? (firstthings.com)
Its honeycombed structure takes advantage of charcoal's porous nature to trap impurities in the air and neutralize odors. (bonappetit.com)