Perviousness refers to the ability to allow liquids and gases to pass through a material. There are various synonyms associated with this word that are commonly used to convey the same meaning. Some of these synonyms include porousness, permeability, absorbency, absorptiveness, and openness. Porousness implies the ability to contain or allow the passage of fluids or air through a material. Permeability implies the ability to allow liquids to pass through without resistance. Absorbency refers to the ability of a material to soak up moisture or water. Absorptiveness is similar to absorbency and means the capacity to absorb any fluid, gas, or heat. Openness refers to the state of being open or accessible.