Permeability refers to which property?

• A. Permeability
• B. Color
• C. Texture
• D. Density

Answer: (A)

Permeability is the ability of a material to allow fluids to pass through it, depending on the connected pore spaces and their pathways. The term itself directly describes this property, so the correct choice is the one that uses the same word. Color describes how the material looks, texture describes surface roughness, and density describes mass per unit volume—none of these tell you how easily fluids move through the material. Understanding permeability helps explain why some materials transmit liquids readily (like sand or gravel) and others resist flow (like clay).