A porous mass is a material that has many small holes or pores, allowing liquids and gases to pass through it. The term 'porous mass' can be used to describe a variety of materials, including sponges. Sponges are a type of porous mass made up of a network of tiny pores and channels that allow water to pass through them. They are often used for cleaning and absorbing liquids, and are also used in medical and industrial applications.