本刊1987年第5期刊登的吴晓辉同志的《实验室制乙炔的几个为什么》,文中第4点说:“碳化钙跟水反应很激烈,气流速度难以控制,为了得到平稳而均匀的乙炔气流,常用饱和食盐水代替水,目的是降低水的浓度,使反应变得缓和些。”我们认为这种解释是不全面的,理由如下: Comrade Wu Xiaohui, published in the fifth issue of the Journal of the People’s Republic of China in the 5th issue of 1987, points out “Some Reasons for Acetylene Production in the Laboratory”. The fourth point in the article states: “Calcium carbide reacts very violently with water, and the gas velocity is difficult to control. In order to obtain a smooth and uniform acetylene, Air flow, commonly used saturated salt water instead of water, is designed to reduce the concentration of water and make the reaction more moderate.” We believe this explanation is incomplete, for the following reasons: