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Studies of Ultrasonic Velocity in Water

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The ultrasonic velocity in water has been calculated by using the theory of Brownian motion and the counteracting molecular forces dependent on structure between 25 °C and 80 °C. We have determined the adiabatic compressibility of the water molecule on the basis of Schaaffs' molecular kinetic theory and studied its temperature dependence.

According to our calculations the anomalous temperature dependence of ultrasonic velocity in water can be interpreted as the temperature dependence of the adiabatic compressibility of the water molecule itself.


Mit Hilfe der Theorie der Brownschen Bewegung und der strukturabhängigen, molekularen Wechselwirkungskräfte wurde die Ultraschallgeschwindigkeit in Wasser von 25 °C…80 °C berechnet. Die adiabatische Eigenkompressibilität der Wassermoleküle wurde unter Zugrundelegung der molekularkinetischen Theorie von Schaaffs bestimmt und auf ihre Temperaturabhängigkeit hin untersucht.

Unseren Berechnungen zufolge kann die anomale Temperaturabhängigkeit der Ultraschallgeschwindigkeit in Wasser als Temperaturabhängigkeit der adiabatischen Kompressibilität der Wassermoleküle selbst interpretiert werden.


On a calculé la vitesse des ultrasons dans l'eau, entre 25 et 80°C, en s'appuyant sur la théorie du mouvement brownien et des forces moléculaires structurelles. On a également déterminé la compressibilité adiabatique propre de la molécule d'eau sur la base de la théorie cinétique de Schaaffs et on en a étudié la dépendance en fonction de la température.

Selon nos calculs, la dépendance anormale de la vitesse de propagation des ultrasons dans l'eau en fonction de la température peut se ramener aux variations thermiques de la compressibilité adiabatique de la molécule d'eau elle-même.
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Document Type: Research Article

Publication date: March 1, 1980

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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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