“If your experiment needs statistics, you ought to have done a better experiment.”
—Ernest Rutherford, 1871–1937, Physicist
By a “porous medium” is meant a solid, or a collection of solid particles, with sufficient open space in or around the particles to enable a fluid to pass through or around them. There are various conceptual ways of describing a porous medium.
One concept is a continuous solid body with pores in it, such as a brick or a block of sandstone. Such a medium is referred to as consolidated, and the pores may be unconnected (“closed cell” or impermeable) or connected (“open cell” or permeable). Another concept is a collection (or “pile”) of solid particles in a packed ...