What gives foam it's sound absorption properties?

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Offline evan_au

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Re: What gives foam it's sound absorption properties?
« Reply #1 on: 27/10/2014 10:06:57 »
Sound absorption works by turning sound energy into heat. Sound absorbent foam often has an an open pore structure - the narrow, winding channels, and changes in area of the pores produces many opportunities for sound waves to interact with the walls, creating turbulent flow and turning the sound into heat.

A somewhat technical description here.