Liquid surface tension coefficient measuring instrument

The utility model is a liquid surface tension coefficient analyzer that adopts joly balance method to measure liquid surface tension which measures the pulling force by a sensor. The proximal prior art adopts the means that the micro-voltage signals are firstly amplified and then measured when processing the micro-voltage signals of the sensor; the measurement accuracy is low, the tensile force is calculated by the sensor through repeated calibration and data fitting and the calculating process is complex. Besides, a lifting mechanism in hand operation is adopted to detach a slinger ring (a coil, or a n-shaped hanging wire) from the liquid level, which affects the test stability. While the utility model has advantages of simple structure, easy operation, little measurement error and good repeatability. And the adopted measure display instrument has a high accuracy rate and can be used directly to display the tensile force values measured by the sensor. A current limiter is provided to regulate the height of the liquid level so as to detach the n-shaped slinger wire off the liquid level without the manual operation and the stability is high. In the process of experiment, the utility model has a clear and directly observable physical phenomenon, and thereby can be applied to teaching of physics, scientific study and industry.