@article{Frosch_2011, title={Very-Low-frequency evanescent liquid pressure waves}, volume={39}, url={https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2440}, abstractNote={Evanescent liquid sound-pressure waves are standing waves of limited spatial extension. These waves involve variable pressure and liquid-particle velocity but negligible liquid-density variation: they are predicted to occur also in strictly ideal liquids. The present note is intended to show that classroom demonstrations of these latter waves can provide a plausible introduction to the subject of spring-driven evanescent liquid sound-pressure waves. That inaccuracy occurs because the small- displacement approximation has been used. In both cases, standing waves with linear oscillations of liquid particles along time-independent streamlines are generated. Since thermal motion and diffusion of the molecules are neglected, in the no-wave state the liquid particle is concluded to keep its initial place and shape.}, number={3}, journal={Canadian Acoustics}, author={Frosch, Reinhart}, year={2011}, month={Sep.}, pages={120–121} }