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  Underwater Acoustics Tutorial- 6. Sound Intensity  
 

 
 
 
     
  6. Sound Intensity  
 

A sound’s acoustic intensity is defined as the acoustical power per unit area in the direction of propagation:

Sound Intensity I = pe /(rc) = rcu

where pe or the "effective pressure" is equal to p/Ö2

r is the density of water

and c is the speed of sound

[NOTE: rc is referred to as acoustic impedance;

rc in water is about 1.5 x 105 (Pa ·s)/m ;

rc in dry 20ºC air is 415 (Pa ·s)/m]

 		  
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