Technique for Measuring the Adiabatic Compressibility,Density,and Sound Speed of Sub-microliter Liquid Samples.

摘要

An acoustical technique for measuring a known function of the adiabatic compressibility and density of a very small liquid sample (0.000004 - 0.004 ml) has been developed. The technique involves a comparison of the conditions required for the acoustic levitation of the sample at a given position in a known, immiscible 'host' liquid and the levitation of a reference droplet of known properties at the same position. It was decided to test the validity of the procedure by using liquids of known properties so that a comparison with our results would be possible. Two particularly attractive features of the procedure are: (1) the results are independent of droplet size, and (2) the parameters of the sound field need not be known. This technique should be directly applicable to measurements of properties of superheated and supercooled liquids.