About the Material Databases for the Acoustics Module
The Acoustics Module includes two material databases: Liquids and Gases, with temperature-dependent fluid dynamic and thermal properties, and a Piezoelectric Materials database with over 20 common piezoelectric materials.
For detailed information about Materials, the Liquids and Gases Materials Library, and the Piezoelectric Materials Library see the COMSOL Multiphysics Reference Manual.
For a discussion about the air and water materials as commonly used in acoustics, as well as attenuation models, and other material properties see the Acoustic Properties of Fluids chapter of this manual.