摘要
任何物理实验不可避免会产生实验误差,一般实验误差呈正态分布,有的实验结果偏大,有的实验结果偏小,这样实验误差才正常。而用拉脱法测量液体表面张力系数的实验误差大小主要取决于操作是否合理,操作准确无误,误差就小。所以老师应该在学生操作之前讲清楚如何拉膜以及拉膜过程中一定要做到玻璃套筒上的刻度线,与反光镜面上刻度线以及玻璃套筒上的刻度线的镜像线三线合一,否则就会产生比较大的实验误差。让学生在操作之前就知道出现误差真正的原因,在实验操作过程中尽量避免出现操作的误差。
There will inevitably be experimental errors in any physical experiment, while the general experimental errors are normally distributed, and some experimental results are large, and some experimental results are small, which is normal. The degree of experimental errors in measuring liquid surface tension coefficient using tearing-off method depends mainly on whether the operation is reasonable and accurate. Therefore, before stu-dents＆#39; operation, the teacher should clearly explain how to pull the film, that it should reach the scale line on the glass sleeve in the process of pulling the film, and that the scale line on the glass sleeve should coincide with its mirror line as well as the scale line on the reflective mirror, otherwise it will produce a relatively large experimental error. The teacher should let students know the real reasons of errors before the operation, so as to avoid operation er-rors as far as possible in the experiment process.
出处
《科教文汇》
2014年第24期100-100,105,共2页
Journal of Science and Education
关键词
液体表面张力系数
拉脱法
实验误差
liquid surface tension coefficient
tearing-off method
experimental errors
