Abstract
This paper deals with the many acoustical investigations, provided by some scientists (Rapuano et al.), in two liquid compounds: benzene C6H6 and carbon disulfide CS2. These compounds are typical liquids where one can observe the acoustical relaxation combined with Kneser processes—energy transfer between translational and vibrational degrees of freedom. Acoustical values, a characteristic of the compounds, were different in many papers and the goal was to try to explain these discrepancies and show how it is possible to avoid these mistakes. The main problem in experimentally determining the relaxation time from the dependence of absorption and frequencies was the narrow frequency range.
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