真空状态下的实验在小学自然教学中出现了多次,但由于很多农村小学没有抽气机,这类的实验只能是“纸上谈兵”,其效果是可想而知,为了让学生更好地理解这个真空状态,我自制了一个“真空”发生器,进行教学实验,取得了很好的效果。一、制作原理装有水的小口容器穴如烧瓶雪在加热沸 Experiments in a vacuum state have appeared many times in primary school nature teaching. However, since many rural primary schools do not have aspirators, such experiments can only be “on paper,” and the effect can be imagined. In order to make students better Understand the vacuum, I made a “vacuum” generator, teaching experiments, and achieved good results. First, the production principle Small mouth with water, such as flasks of snow boiling in the heating