在郑州市科技馆里,你会看到两个与物态变化有关的科学表演项目:一个是关于液氮的,另一个是关于干冰的.由于干冰和液氮的温度比常温低得多,且不易保存,因而不适合以展品的形式展出,科技馆采取表演互动的形式来向观众演示这两种物质的特性及其相关试验. In the Science and Technology Museum of Zhengzhou City, you will see two scientific performance projects related to the change of state: one is about liquid nitrogen and the other is about dry ice. Because the temperature of dry ice and liquid nitrogen is much lower than the normal temperature, It is not easy to save, so it is not suitable for exhibiting in the form of exhibits. Science and Technology Museum takes the form of interactive performances to demonstrate to the audience the characteristics of these two substances and their related experiments.