老师在上自然常识课的“热空气上升”内容时,没有演示,大家看不明白。我制作了一个演示器,它能演示同体积的冷空气受热、膨胀、变轻和上升,并推动筒内的纸片或筒上方的小风车转动。非常直观,效果很好。 When the teacher was in “hot air up” in the course of nature common sense, he did not demonstrate it and everyone did not understand it. I made a presenter that demonstrated that the same volume of cold air was heated, swollen, lightened, and ascended, and propelled a small pinwheel above the paper or tube in the barrel. Very intuitive and effective.