blog.rosebrand.com: Fundamentally, absorption of sound occurs when air molecules interact with the pores of a porous material. Acoustical energy, transmitted through air, is dissipated as a result of viscous effects and thermal conduction with the material. The effective absorption of a material is determined by a combination of characteristics: the porosity and thickness of the material, how deeply air penetrates it, whether it is mounted to a hard or soft backing, and whether there’s an airspace behind it.
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