Attenuation of Sound in Air

The attenuation of sound in air at 20°C due to viscous, thermal and rotational loss mechanisms is 1.6E-10f2dB/m. However, losses due to vibrational relaxation of oxygen molecules are generally much greater than those due to classical processes, and the attenuation of sound varies significantly with temperature, water-vapour content and frequency.

Reference

ISO 9613-1 : 1993 (E) NOISE ABSORPTION BY AIR

See also: Acoustics, Attenuation, Sound, Sound Propagation.

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Subjects: Noise & Vibration Physics


Weblinks:
NPL: Kaye and Laby The speed and attenuation of sound.