NEW ELECTROMAGNETIC DYNAMOMETER: MEASURING THE SURFACE TENSION OF LIQUIDS

A. Benabdellah, Z. Abbassi, A. Nakheli

Abstract: We realized an electromagnetic force sensor for measuring the surface tension of liquids by Wilhelmy plate method. The accuracy of the sensor is ?m= 0.3 mg and referring to the force is ?F = 3µN. the surface tension of water-ethanol systems was obtained by the accuracy of ?s = 0.06 dynes/cm. The operating principle of this dynamometer is based on the fundamental laws of electromagnetism (Faraday-Lenz law) and the mechanical properties of elasticity of a spring. The values obtained of the surface tension with our device are in good agreement with the results expected found in the bibliography

Keywords: Electromagnetic dynamometer, Wilhelmy plate method, accuracy, surface tension

DOI: https://doi.org/10.15623/ijret.2014.0309039