threshold of hearing

physiology

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In sound: Dynamic range of the ear
…audible pressure amplitude, at the threshold of hearing, is about 10^-5 pascal, or about 10^-10 standard atmosphere, corresponding to a minimum intensity of about 10^-12 watt per square metre. The pressure fluctuation associated with the threshold of pain, meanwhile, is over 10 pascals—one million times the pressure or one trillion…
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