Method and apparatus for the measurement of surface tension

摘要

The invention relates to methods and apparatus for the detection of changes in surface tension of a liquid by introducing an inert gas under pressure into the liquid to form an inert gas-liquid mixture, decompressing the mixture to provide bubbles which increase in size and generate sounds and measuring the sound intensity of the sound generated by the decompression of the gas-liquid mixture. Inasmuch as the addition of pollutants to water changes the surface tension characteristics of the water, the present invention is applicable to the monitoring of water for the detection of pollutants.