高一化学《氨铵盐》一节在讲氨的物理性质时，只介绍氨很容易液化，液态氨气化时要吸收大量的热，能使它周围物质的温度急剧降低，因此，氨常用作制冷剂。因未安排演示实验，这使得教学缺乏直观性，学生对液氨的制冷作用也总是持怀疑态度，为此我们查阅资料，改进补充下面这个 Gao Yi Chemical’s “Ammonium Ammonium Salt” section talks about the physical properties of ammonia. It only describes that ammonia is easy to liquefy. When liquid ammonia gasifies, it needs to absorb a lot of heat, which can cause the temperature of its surrounding material to drastically decrease. Therefore, ammonia is commonly used. As a refrigerant. Due to the fact that no demonstration experiment was arranged, this made the teaching less intuitive and the students always had skepticism about the cooling effect of liquid ammonia. For this reason, we consulted the data and improved the following: