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Mechanism of the sound absorption in H2O and D2O liquid water

By assuming the dynamical change in water structure as a double relaxation mechanism, we obtained the values of the relaxational and instantaneous thermodynamic parameters. The isobar expansibility (Λ0) as derived by thermodynamic means reduces to an approximate form Λ0 = A+C/V T 2 +D/V T 3, where V is the molar volume and T the absolute temperature. The quantities A and C/V T 2+D/V T 3 give the instantaneous part (Λ∞) and the relaxational part (Λ r ) of the isobar expansibility. The other thermodynamic relaxational and instantaneous parameters can be expressed in terms of Λ∞ and Λ r . Assuming two independent relaxtion times, in which the longer one is the time for a framework molecule to reorient and the shorter is the time in transit during the jumping process of a molecule, the related relaxational compressibilities are subdivided into two parts according to the mechanisms. The longer relaxation time has a spread where the ratio of the times for the lower and upper limit is a constant (2) indepedent of temperatures. The spread of relaxation times can be explained by our model based on the dielectric relaxation times.