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Sound waves can be expressed as a difference in pressure between their peak [[compression]]s and [[rarefaction]]s, or, more practically, by their loudness or ''[[sound pressure level]]''.
 
Sound waves can be expressed as a difference in pressure between their peak [[compression]]s and [[rarefaction]]s, or, more practically, by their loudness or ''[[sound pressure level]]''.
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[[Category:Physics]]
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