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acoustic intensity

amount of energy flowing per unit time through a unit area that is perpendicular to the direction in which the sound waves are travelling. Sound intensity may be measured in units of energy or work-e.g., microjoules (10-6 joule) per second per square centimetre-or in units of power, as microwatts (10-6 watt) per square centimetre. Unlike loudness, sound intensity is objective and can be measured by auditory equipment independent of an observer's hearing

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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