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.

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