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在《热空气》一课中,教师若提供精致的热气球,实验看上去成功,但含金量不高,而让学生自做的热气球上天,品种繁多,异彩纷呈,探究活动才有特色。我没有给学生提供精致的口袋,而是让他们用锯条或其它可以利用的工具,将塑料薄袋按自己的愿望制成不同样子的热气球。这样做出来的有大有小,有长有短,有方有圆。学生开始烫袋子时不太顺利,没掌握塑料的特性,一触火就是一大洞。他们
In the course of “hot air”, if teachers provide exquisite hot-air balloons, the experiment may seem successful but the gold content is not high. The hot-air balloons let students do their own thing, variety and variety, and inquiry activities are unique. Rather than providing students with elaborate pockets, I asked them to use a saw blade or other available tools to make plastic thin bags of hot air balloons of different shapes to their liking. There are big and small things that come out in this way. Students do not go well with hot bags and do not know the characteristics of plastic. A touch of fire is a big hole. they