1 Introduction.- 2 Model of the Internal Structure of a Porous Dielectric.- 3 Equilibrium Physical Parameters of Porous Dielectrics.- 4 The Theory of Fast Nonstationary Phenomena in Porous Dielectrics.- 5 On Specific Features of Thermal Conduction and Diffusion in Porous Dielectrics.- 6 Behavior of Porous Dielectrics in Acoustic and Electromagnetic Fields.- 7 Conclusion.- B Collision Integrals and Relaxation Time Calculation.- C Simplified Theory of Thermal Conduction in a Porous Dielectric.- D.1 Theory of Fluctuations.- D.2 Fluctuations of the Main Thermodynamic Values.- References.