This monograph is the ?rst systematic presentation of the theoretical fun- mentals of the physics of porous structures and it is intended for basic fa- liarization with the subject. That is why we tried to avoid, where possible, excessive mathematics and to pay as much attention to the visual presen- tion of the general physical picture of various phenomena as possible. Even in those cases where there is an accurate mathematical theory we avoid ri- rous mathematical proofs, assuming that the reader is acquainted with the fundamentals of quantum mechanics and statistical physics and in...