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    Calculate change of Speed of Sound in fibrous material



c= speed of sound in air = 344 meters or 1128.6 feet
c'= speed of sound in long fiber wool
P= packing density of the fibrous material = 8kg/m3



Speed of sound in air [c]: m/s
Packing density of the fibrous material [P]: kg/m3
 
Speed of sound in long fiber wool [c']: m/s