二氧化碳的密度是其重要的物理性质之一,是利用向上排空气法收集二氧化碳的重要依据。笔者查阅了各种版本的教材对二氧化碳密度的介绍,它们或是用语言直接陈述,或是用称量法,或是用熄灭燃着的高低不同的蜡烛的简单实验演示方法。用语言直接描述比较抽象,说服力不强,学生有种被告知的感觉;用称量法演示,托盘天平精确度差,现象不明显,学生不易观察,有 The density of carbon dioxide is one of its important physical properties. It is an important basis for utilizing the up-air method to collect carbon dioxide. The author looked at the various versions of the textbook on the density of carbon dioxide, they are either directly stated in the language, or by weighing method, or extinguished with a burning light of different levels of simple experimental demonstration candle. Direct description of the language is more abstract, persuasive is not strong, the students were told to have a feeling; with weighing method demonstration, tray balance accuracy is poor, the phenomenon is not obvious, students are not easy to observe, there are