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《肺和呼吸》一课有让学生“比较我们吸进的空气和呼出的气体”实验。放入燃烧的火柴进行比较。用装满水的杯子倒扣在水槽中,用吸管向杯中吹气,从而收集呼出的气体,用玻璃片盖好待用;再用另一杯子准备一杯新鲜空气,同样用玻璃片盖好待用。然后用点燃的火柴分别放入两个杯中,观察它们的变化。最后分析上面两组对比实验的结果,能说明什么&做这个实验,我是按照课文中的插图如法炮制,点燃的火柴从瓶口插入都燃烧得很厉害,如果想延长时间,进行仔细观察,必会烧你
The lesson “Lungs and Breathing” has students experimenting with “comparing the air we breathe in and the air exhaled”. Put in a burning match for comparison. Inverted with a cup filled with water in the sink, with a straw blown to the cup to collect exhaled gas, covered with glass ready for use; and then another cup to prepare a glass of fresh air, also covered with glass stand-by. Then use the lit match into two cups, observe their changes. Finally, the above analysis of the results of two sets of comparative experiments, to illustrate what & do this experiment, I follow the illustrations in the text according to the law, the ignition of the matchstick from the bottle are burned very powerful, if you want to extend the time for careful observation, Will burn you