Method for measuring surface tension coefficient of liquid by injecting liquid into round tank

Abstract

The invention provides a method for measuring a surface tension coefficient of liquid by injecting the liquid into a round tank and relates to measurement of physical parameters. The round tank comprises two cylinders with the same center axis and a sealing bottom plate shared by the two cylinders, and a small hole is formed in the sealing bottom plate of the round tank. The round tank is put on a platform, the small hole of the round tank is suspended outside the platform, a measuring glass is put under the small hole, the liquid with the volume of Q1 is poured into the round tank, the round tank stands still until no liquid drops from the lower side of the small hole, the volume Q2 of the liquid in the measuring glass is read, the radius ro of the inside of the outer cylinder and the radius ri of the outside of the inner cylinder are measured, and the surface tension coefficient of the liquid is sigma=[rho*(Q1-Q2)*g] / [2pi*(ro+ri)]. The method has the beneficial effects that if the measurement precision of mass or volume is high enough, the largest error of a device is gravity generated by mass of a liquid drop, so the error is small; the structure is simple and the cost is low.

Description

technical field [0001] The invention relates to the measurement of physical parameters, especially the measurement of the surface tension coefficient of liquids. Background technique [0002] Common methods for measuring the surface tension coefficient of liquids are: maximum bubble pressure method, capillary method, pull-off method, etc. The measurement methods are either relatively complicated, such as the maximum bubble pressure method, pull-off method; or the measurement accuracy is not high, although the capillary method is simple , but the liquid surface is curved, and the height of the liquid column is not accurate enough. Since the liquid surface outside the capillary also rises along the tube wall outside the capillary, it is difficult to determine the coordinate value of the horizontal position of the liquid surface, which leads to the determination of the inside of the capillary. The height difference of the liquid column is more difficult. Contents of the inven...

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Problems solved by technology

[0002] Common methods for measuring the surface tension coefficient of liquids are: maximum bubble pressure method, capillary method, pull-off method, etc. The measurement method is either complicated, such as the maximum bubble pressure method, pull-off method; or the measurement accuracy is not high, although the capillary method is simple , but the liquid surface is curved, and the height of the liquid column is not accurate enough. Since the liquid surface outside the capillary also rises along the tube wall outside the capillary, it is difficult to determine the coordinate value of the horizontal position of the liquid surface, which leads to the determination of the inside of the capillary. The height difference of the liquid column is more difficult

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