金属热膨胀现象人眼难以清楚的观察到,若设计如图1所示的实验装置,则可显著的提高演示效果,激发学生兴趣,培养学生创新意识。一、实验装置及材料如图1所示,在一个自制的架子上,有由两组杠 Metal thermal expansion phenomenon is difficult to clearly observe the human eye, if the design shown in Figure 1, the experimental device, you can significantly improve the demonstration effect, stimulate student interest and cultivate students’ sense of innovation. First, the experimental device and materials shown in Figure 1, in a self-made shelves, there are two groups of bars