As particle size increases, how does permeability change?

Permeability is a measure of how easily fluids can move through a material, and it is closely related to the size of the particles that make up that material. As particle size increases, the spaces or pores between the particles also tend to increase. Larger particles create larger void spaces, allowing fluids to flow more freely through those spaces. This results in a significant increase in permeability.

In contrast, smaller particles tend to pack more closely together, resulting in smaller pore spaces that can restrict flow and decrease permeability. As such, the relationship between particle size and permeability is generally direct; larger particles facilitate a greater flow of fluids compared to smaller particles. Therefore, as particle size increases, permeability increases significantly.