The Modern Era

Abstract

The development of basic relations in the classical era: the stress concept, the elasticity law, the fundamental laws of Delesse, Fick, and Darcy, the foundation of the mixture theory by Maxwell and Stefan, as well as the foundation of thermodynamics, all these had provided enough background material in order to treat empty or fluid-saturated porous solids. Indeed, in this century, the theory of porous media has been at last firmly established based on the achievements of the nineteenth century.