Abstract
1. Introduction 2. Methods of Quantum Field Theory in Statistical Physics 154 3. The Energy of a Condensed Body Associated with Long-Wave Electromagnetic Fluctuations 158 4. Molecular Forces between Solids 164 a) Derivation of the General Formula 164 b) Discussion of the General Formula and Limiting Cases 166 c) The Effect of Temperature 169 d) Interaction of Individual Atoms 170 5. Thin Films on the Surface of a Solid 171 a) Chemical Potential of a Film 171 b) Forces of Nonelectromagnetic Origin 174 c) Film of Liquid Helium 175 References 176