Liquid surface tension coefficient metering instrument

Abstract

The invention discloses a liquid surface tension coefficient metering instrument, which comprises: a base (1); an upright post (2) fixed on the base (1); a fixed sliding block (3) arranged on the upright post (2); a gear and a handle rotating the gear, which are arranged in the sliding block (3); a lifting sliding block (4) of which the rack is matched with the gear; a guiding device arranged between the lifting sliding block (4) and the fixed sliding block (3); a force sensor device arranged on the lifting sliding block (4) in a suspended manner; a round fixed bracket (8) supported by the force sensor device through a group of thin wires with adjustable length; an aluminum alloy hand ring (6) which contacted with the surface of tested liquid and arranged in the round fixed bracket (8); a small level gauge (7) arranged in the round fixed bracket (8) which fixes the aluminum alloy hand ring (6); and a temperature controlling heating device arranged on a container of the tested liquid. The instrument is convenient in measurement and is greatly improved in measurement accuracy compared with original instrument.

Description

technical field [0001] The invention generally relates to a physical experiment device, in particular to a liquid surface tension coefficient measuring instrument for measuring different temperatures. Background technique [0002] In physical experimental devices, especially in thermodynamic experimental devices, it is often involved in the experiment of measuring the surface tension coefficient of liquids at different temperatures. As a result of molecular interactions within the liquid surface layer, the liquid surface naturally shrinks, like a stretched elastic film. The force along the tangential direction due to the contraction of the liquid surface is called surface tension. The existence of surface tension causes many unique phenomena on the liquid surface, such as wetting, capillarity, and propagation of water surface waves. These phenomena have many applications in industry, agriculture, and daily life. [0003] There are many methods for measuring the surface ten...

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Problems solved by technology

Therefore, it is difficult to judge whether the suspension ring is level, and poor adjustment will directly affect the accuracy of the measurement results.

Second, the lifting ring of the instrument is driven by a screw nut. The transmission device uses a fine thread. It is very difficult to adjust the up and down movement of the stage during measurement. In addition, the movement of the original instrument is short. The liquid film is often pulled continuously; in addition, when the lifting nut is adjusted, the glassware containing the liquid will shake, which will easily cause the liquid film to break and reduce the measurement accuracy; third, the instrument does not have a heating device, so it can only measure the temperature at room temperature. Coefficient of surface tension of liquid, cannot measure the coefficient of surface tension of liquid at the required temperature

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