MEASURING INSTRUMENT FOR LIQUID SURFACE TENSION COEFFICIENT

Description:
Surface tension coefficient of liquid is an important parameter representing the property of liquid, which is widely used in industry, medicine and scientific research. To measure the surface tension, the Joly balance and torsion balance were commonly used in the traditional experiment but it is low in accuracy and poor in stability without digital output directly.
Measuring apparatus of surface tension coefficient of liquid is a new one for measuring the surface tension coefficient of liquid by way of silicon single-crystal resistance strain gage. Compared with the original one, it has three advantages as below:
1. Application of silicon single-crystal resistance strain gage to measuring the surface tension of liquid that is contacted with metal makes the apparatus high in sensitivity and perfect in linearity and stability. The value can be displayed by a digital voltmeter.
2. Adopting thin wire loop with certain height and sheet metal to replace the original platinum wire loop or platinum wire edge, which is undeformed or not be damaged for using over again.
3. The wire loop is designed and tested in its outline for special purpose, so the result directly measured has no need of correction. It can obtain a reliable and accurate result.
EXPERIMENTS:
With less measuring error of surface tension of liquid and good repeatability of the loop, this apparatus is favorable to the students learning and mastering the principle and using method of silicon single-crystal resistance strain gage. It is suitable for fundamental physics and chemical experiments both in college and technical secondary school. 

Details: