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</html><description>General Acoustics Concepts Porous materials are those in which the solid part that constitutes them occupies only part of their volume, the remaining part being formed by small gaps, open to the exterior and which may (or may not) communicate with each other. Sound absorption is fundamentally processed by energy dissipation due to air friction [&hellip;]</description><thumbnail_url>https://imperalum.com/cms/wp-content/uploads/2014/08/materiais-porosos.gif</thumbnail_url></oembed>
