Abstract: Continuing experiments designed to look at therrnoacoustic effects in a single pore will be described. A volume-modulation technique is employed to measure the complex compressibility of a gas in the pore directly. When a temperature gradient is imposed on the pore, the complex compressibility is sensitive to thermoacoustic effects which can be measured to high precision. These effects depend on both thermal and viscous properties of the gas. Measurements for a wide range of gradients are presented and compared to predictions of the theory. Generally good qualitative agreement is found. The technique can easily be extended to study novel stack geometries such as those with varying cross section or with tailored temperature gradients
