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一、用来制量杯在学习“物体的长度和体积测量”时,利用实验室中的量筒和一些水,我们就可以安排学生把一次性塑料杯改制成量杯.具体的做法是:用量筒量取5mL 的水,把这些水倒入空的一次性塑料杯中,杯子放在水平台面上,在杯中的水面相应处,用彩水笔画上刻度线,并在平行的位置上写上小小的“5”字,采用同样的方法,作出10mL、15mL、20mL 等一系列的刻度线.二、接听土电话在学习“声音的产生与传播”时,分别在两个塑料杯的底部中央,用针锥打孔,孔不易过
One, used to measure the cup in the study “object length and volume measurement ”, the use of measuring cylinders and some water in the laboratory, we can arrange for students to change disposable plastic cup into a measuring cup. The specific approach is: The measuring cylinder measures 5 mL of water. Pour the water into an empty disposable plastic cup. Place the cup on the water platform. Place a mark on the water surface in the cup. Use a colored fountain pen to draw a tick mark and write it in a parallel position. The small “5” word uses the same method to make a series of tick marks such as 10mL, 15mL, and 20mL. Second, when listening to the phone call, when learning “the generation and propagation of sound”, two The center of the bottom of the plastic cup is punched with a needle cone and the hole is not easy to pass