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Die physikalisdie Deutung des molaren Sdiallvolumens und der darin enthaltenen Raosdien Regel

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A critical reviews is given on the use of RAO'S expression u1/a V (“molar velocity of sound”). In continuation of an earlier investigation it is shown that RAO'S expression is part of a certain volume called “molar sound volume”. The molar sound volume is equal to the product of the radius of the molecule and the cross-section of the unit cell. The collision coefficient, which is of great significance in the propagation of sound is contained in the molar sound volume. It is shown that with decreasing temperature the collision coefficient approximates to the ideal value of 4 at absolute zero. The additivity of RAO'S expression from atomic increments is poor; this is in contrast to the good additivity of the molecular volume per mole. “Molar velocity of sound" is not an independent quantity of physical significance.
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Document Type: Research Article

Publication date: January 1, 1962

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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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