Device for measuring liquid surface tension by pull-out method

Abstract

The invention relates to a device for measuring liquid surface tension by a pull-out method, which relates to the field of measurement of physical parameters and particular to measurement of surface tension coefficients, and aims to avoid errors caused by a non-horizontal hoisting ring during surface tension measurement. According to the technical scheme, a hoisting ring is formed by a cylinder and a spherical surface which are connected with each other; liquid is stored in a circular water tank, and a hole is formed in the middle of the circular water tank; and a small ball is arranged at the top of a connecting rod of a pressure sensor, the connecting rod extends into the hole from the lower part of the hole, the small ball is in contact with the neighboring part of the top of the spherical surface of the hoisting ring, and a water pipe and a water pipe switch are arranged in the circular water tank. The device has the benefits that the spherical surface is in point contact with the small ball, the bottom of the hoisting ring is not horizontal to lead to asymmetry of surface tension at the bottom of the hoisting ring, and the surface tension acts in the form of a tension arm and drives the spherical surface to make micro displacement, so that the bottom of the cylinder of the hoisting ring is in one horizontal plane.

Description

technical field [0001] The invention relates to the field of measurement of physical parameters, especially the measurement of liquid surface tension coefficient. Background technique [0002] In physical experiments, the surface tension of liquid can be measured by the pull-off method. The commonly used measurement principle is the same as the patent "A Liquid Surface Tension Coefficient Tester (Application No. CN01254339.X)". The measurement principle is: a linear or planar The object generally adopts a linear ring-shaped object, referred to as a suspension ring. The bottom of the suspension ring is in contact with the liquid surface, and there is a traction rope on it. The traction rope lifts the suspension ring upwards. (This part is relatively small), surface tension is composed of three parts, pull up, the direction of surface tension and gravity is the same, both are vertical downward forces, when the bottom of the ring is higher than the liquid level, the effect of s...

AI Technical Summary

Problems solved by technology

[0003] The problem is that if the bottom of the suspension ring is not in the same horizontal plane, the liquid surface will not break at the same time, causing the liquid surface to break first from the high point of the inclined surface, and then the adjacent position will break, so that the measured surface The tension is smaller than the real value, which brings a large experimental error

[0004] To adjust the level of the suspension ring, three metal wires are generally used as the suspension wire of the suspension ring (called the suspension wire in CN01254339.X). By bending the metal wire and using eyes to judge whether the bottom of the suspension ring is in a horizontal plane, theoretically speaking, three points determine A plane, there is the possibility of adjustment, but in fact there is a large personal experience error; moreover, the adjustment is difficult and the measurement speed is slow

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