1. the quality or state of being porous; having small holes or spaces that allow liquids or gases to pass through

Examples

• The porousness of the soil allowed water to drain quickly after the rain.
• Scientists tested the porousness of different rock samples.
• The sponge’s porousness makes it excellent for absorbing spills.
• The porousness of the concrete caused moisture problems in the basement.
• Volcanic rock is known for its high degree of porousness.
• The porousness of the fabric made it breathable and comfortable to wear.