How to choose a surface tension meter

We generally call the tension between the liquid phase and the gas phase surface tension. For example, we say that the surface tension of water at 20°C is 72.75, which means the surface tension at the interface between water and air. We also call the tension between liquid phase and liquid phase interfacial tension. For example, tertiary oil recovery in the petroleum industry needs to measure the interfacial tension between oil displacing agent and crude oil. Although the above classification is not very rigorous, we generally refer to the tension between the liquid phase and the gas phase as surface tension. For example, we say that the surface tension of water at 20°C is 72.75, which means the surface tension at the interface between water and air. We also call the tension between liquid phase and liquid phase interfacial tension. For example, tertiary oil recovery in the petroleum industry needs to measure the interfacial tension between oil displacing agent and crude oil. Although the above classification is not very rigorous, it is in line with the understanding of general user habits and will continue to be used in the following. As for the test of liquid-solid contact angle/solid surface energy and other properties, it is explained in the article 'How to choose a contact angle measuring instrumentThe automatic tension meter is a simple and easy testing instrument that uses physical methods instead of chemical methods. It can quickly and accurately measure the surface/interface tension values u200bu200bof various liquids. It is not only a necessary instrument for scientific research and teaching, but also used in most production industries. The measurement methods mainly include platinum plate method, platinum ring method, rotating drop method, hanging drop method, and bubble pressure method. The corresponding instrument model, scope of application and application direction are introduced below.