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Sound Absorption

Sound Absorption is what happens when a soft material soaks up noise instead of bouncing it back.

Think of it this way

A thick towel laid across a hard counter soaks up water instead of letting it splash back. Sound works the same way in a soft room. Hard walls bounce sound waves back like a tile floor bounces water drops. Soft walls, like foam or carpet, soak the waves in, so the sound fades out fast.

Explaining sound absorption by grade level

Think about a loud road near your home. A thick wall can block the noise, but soft things soak it up. A hard wall bounces sound back at you. A soft wall traps the sound inside it, so less noise gets through.

Projects that explore sound absorption

Sound Barrier Materials and Highway Noise Reduction

Soft, loose materials soak up sound energy instead of bouncing it back. An earth berm is a mound of packed soil with air pockets between particles. In one highway noise test, the earth berm reduced noise the most at every distance, outperforming rigid concrete and wood barriers. The loose soil absorbed more sound waves, while hard surfaces let more noise through.

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