Rotational Relaxation in Nitrogen, Oxygen, and Air

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Abstract
The speed and attenuation of sound at 11 Mc were measured in N2, O2, and dry air at various pressures between atmospheric and a few mm Hg. The rotational collision numbers were found to be: for N2, 5.26±0.05; for O2, 4.09±0.08; for air, 4.82±0.18.