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. 2008 Aug 20;9(4):291–302. doi: 10.3348/kjr.2008.9.4.291

Fig. 3.

Fig. 3

Relationships between sound pressure, power, energy, and intensity. Sonic intensity, defined as energy passing through unit area within unit time, is derived from plane wave. As seen in equation, intensity is proportional to square of acoustic pressure and is also function of property of medium (density and speed of sound) through which waves are propagated.