现行高中物理(甲种本)第二册58页上有这样一段话:“在标准状况下,一空气分子在一秒内与其它空气分子的碰撞竟达65亿次之多,……。”笔者认为,上面阐述中的一个空气分子的说法欠妥。众所周知,空气是由氮气、氧气、二气化碳、水蒸气和少量惰性气体组成的混和物,属于宏观的范畴,空气是许多不同分子的集合体,不能讲个数。而分子是保持物质化学性质的基本微粒,属于微观的范畴,是构成空气的基本微粒,可以讲个数。因此,空气与分子不能并列用“个”这个量词。我们可以说空气中的某一个分子,如:空气中 The current high school physics (A type book) in the second volume of 58 pages has such a paragraph: “Under the standard conditions, an air molecule collides with other air molecules in one second as much as 6.5 billion times....” The author believes that the statement of an air molecule as described above is not proper. As we all know, air is a mixture of nitrogen, oxygen, carbon dioxide, water vapor, and a small amount of inert gas. It belongs to the macroscopic category. Air is a collection of many different molecules and cannot be counted. The molecule is the basic particle that maintains the chemical nature of the substance and belongs to the microscopic category. It is the basic particle that makes up the air and can be counted. Therefore, the quantifier “a” cannot be used in parallel with air and molecules. We can say that a molecule in the air, such as: in the air