粘滞系数实验的误差修正及实验条件选择

该文就落球法测量液体粘滞系数实验中的误差修正及部分实验条件选择进行了讨论。通过测试得到的实验数据,利用最小二乘法得出修正系数并不总是恒定值的结论;还利用Matlab模拟出小球下落达到匀速时的位移,使实验者可以比较准确地选择计时起点和小球的大小、掌握终极速度的测量,从而减小误差。还可以看到,小球是否是从量筒中心下落对测量结果的影响也比较大,应同样注意控制。

Error Correction and Choice of Experimental Conditions in the Experiment of Viscous Coefficient

This paper discussed Error Correction and Choice of Experimental Conditions in the Experiment of Viscous Coefficient through the falling ball method. It is concluded, through the experimental data, that the coefficient is not constant. The displacement of falling ball, when the constant velocity reached, is simulated by Matlab simulation, which is helpful to choose the experimental condition andis useful to accurately start the timer, select the size of the falling ball and measure the terminal velocity, to reduce errors. Meanwhile, it strongly impacted on the measurement results whether the ball falling along the center of the metering tank, which should be controlled.