Abstract
Abstract We consider the following question: Suppose part of the boundary of a cavity containing a gas is set into oscillation, the damping in the boundary being small. What is the nature of the oscillations in the gas? We treat the low-frequency limit (wavelength much greater than dimensions of the cavity). Experiment shows that for small volumes of gas the oscillations are intermediate between adiabatic and isothermal extremes. As the volume of gas is increased, amplitude-dependent changes in the frequency are observed: one can plot a phase diagram (based on amplitude and volume) delineating three regions: intermediate, transition, and isothermal. The reason for the amplitude dependence is not clear.
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