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Measurements of sound absorption in water and in aqueous solutions of electrolytes

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By means of four types of apparatus, working in successive frequency ranges, absorption measurements were made in the large frequency range 4 · 103 to 108 c/s. For the lowest frequencies (4–50 kc/s) the absorption was determined from the decay of single normal modes of oscillation of a spherical vessel, filled with the solution. In the medium range (50–1000 kc/s) a reverberation method was applied. Above 1 Mc/s the attenuation of progressive waves was measured with the optical method, using two different techniques (3–15 Mc/s and 20–100 Mc/8).

The measurements in water yield a value α/v 2 = 25 · 10−15 s2/m at 20°C, independent of frequency down to 100 kc/s.

The experimental results with electrolytes permit a number of fundamental conclusions with respect to the dependence of the absorption on frequency, on concentration, temperature and PH-value of the solutions and on the properties of the ions such as valency and ion radius.

The results indicate relaxation processes. As an attempt of interpretation, four models are discussed: 1., excitation of molecular degrees of freedom, 2., hydration of the ions, 3., formation of ion associates, and 4., hydrolysis, the latter being the most probable one.
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Document Type: Research Article

Publication date: January 1, 1953

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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