摘要
使用高精度的力敏传感器测量了纯净水和15#白油的表面张力系数,分别为72.8 mN/m和30.6mN/m,相对误差分别为0.55%和1.6%,测量误差较小。实验过程中,力敏传感器的数显特点,使学生直观地观察到电压值的变化过程,便于分析液膜拉脱过程的受力情况。比较了纯净水和15#白油的拉脱液膜状态,可得出表面张力系数小的液体拉出的液膜较长。
Surface tension coefficients of pure water and 15＂ white oil were measured based on force sensor, and the results are 72. 8 mN/m and 30. 6 mN/m, and relative errors are 0. 55% and 1. 6%. The error is smaller. On the measuring process, students might observe the experimental phenomena intuitively and understand surface tension more deeply for digital display features of force sensor. Comparing to liquid film of pure water and 15＂ white oil,it is followed that the liquid film is longer for the smaller surface tension coefficient.
出处
《实验室研究与探索》
CAS
北大核心
2010年第8期18-20,共3页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(50677005)
辽宁省科技厅计划项目(2004220007)
关键词
表面张力系数
拉脱法
力敏传感器
surface tension coefficient
pull-apart method
force sensor
