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Why is plastic and foam a good material for ear defenders?

Why is plastic and foam a good material for ear defenders?
asked 216k views
3 votes
Why is plastic and foam a good material for ear defenders?

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User Jeffrey
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1 Answer

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The main reason why both plastic and foam are good materials for ear plugs and other acoustic treatment is that they're very dense but at the same time have little holes that absorb the sound waves. 
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User Sanxofon
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