تعريف porous medium في الإنجليزية الإنجليزية القاموس.
A porous medium or a porous material is a solid (often called frame or matrix) permeated by an interconnected network of pores (voids) filled with a fluid (liquid or gas). Usually both the solid matrix and the pore network (also known as the pore space) are assumed to be continuous, so as to form two interpenetrating continua such as in a sponge. Many natural substances such as rocks, soils, biological tissues (e.g. bones), and man made materials such as cements, foams and ceramics can be considered as porous media. A poroelastic medium is characterised by its porosity, permeability as well as the properties of its constituents (solid matrix and fluid)