FIELD: measuring instruments. SUBSTANCE: liquid film is formed on a frame holder. A part of the frame holder is movable. A force that acts on the movable part of the frame is measured and surface tension coefficient is determined by this measuring. The movable part of the frame is made of a thread made of electrically conducting rubber. Resistance of the thread is measured. The force that acts on the thread is measured by this measuring. EFFECT: enhanced accuracy. 1 dwg
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