Preface. Chapter 1. Planar Fluid Interfaces. Mechani cal properties of fluid interfaces. Thermodynamical properties of plana r fluid interfaces. Kinetics of surfactant adsorption. Summary. Refer ences. Chapter 2. Interfaces of Moderate Curvature: Theory of Capillarity. The Laplace equation of capillarity. Axisymmetri c fluid interfaces. Force balance at a three-phase-contact line. Summa ry. References. Chapter 3. Surface Bending Moment and Curvatu re Elastic Moduli. Basic thermodynamic equations for curved in terfaces. Thermodynamics of spherical interfaces. Relations with the m olecular theory and the experiment. Summary. References. Chap ter 4. General Curved Interfaces and Biomembranes. Theoretica l approaches for description of curved interfaces. Mechanical approach to arbitrarily curved interfaces. Connection between the mechanical and thermodynamical approaches. Axisymmetric shapes of biological cells. Micromechanical expressions for the surface properties. Summary. Refer ences. Chapter 5. Liquid Films and Interactions Between Partic