What is porous meaning?

Porous refers to a material or object that has small holes or spaces, often allowing liquids or gases to pass through. The degree of porosity can vary, with some materials being only slightly porous while others are highly porous. Porous materials include sponges, filters, and some types of rock. Porous substances are often used in filtration systems, such as in water treatment plants or air purifiers, as they are able to trap contaminants while allowing the desired substance to pass through. However, porosity can also be a problem in construction materials, as it can make them more susceptible to damage or degradation over time.