1. Introduction 2. Fundamentals of Interface and Colloid Science 3. Fundamentals of Acoustics in Homogeneous Liquids: Longitudinal Rheology 4. Acoustic Theory for Particulates 5. Electroacoustic Theory 6. Experimental Verification of the Acoustic and Electroacoustic Theories 7. Acoustic and Electroacoustic Measurement Techniques 8. Applications for Dispersions 9. Applications for Nanodispersions 10. Applications for Emulsions and Other Soft Particles 11. Titrations 12. Applications for Ions and Molecules 13. Applications for Porous Bodies 14. Peculiar Applications of Acoustics and Electroacoustics for Characterizing Complex Liquids