2.8 What is sound intensity ?
Description
This article is from the Acoustics FAQ, by Andrew Silverman with numerous contributions by others.
2.8 What is sound intensity ?
This may be defined as the rate of sound energy transmitted in a specified direction per unit area normal to the direction. With good hearing the range is from about 0.000000000001 Watt per square metre to about 1 Watt per square metre (12 orders of magnitude greater). The sound intensity level is found from intensity I (W/m^2) by:
Sound Intensity Level = 10 x lg (I/1.0E-12) dB
Note: 1.0E-12 W/m^2 normally corresponds to a sound pressure of about 2.0E-5 Pascals which is used as the datum acoustic pressure in air.
Sound intensity meters are becoming increasingly popular for determining the quantity and location of sound energy emission.
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