罩式气压计是经过反复实验和改进制成的，既可测量又可演示，操作简便、省时、无污染的水银气压计。实现了托里拆利演示器的新突破。1．特点问）水银不扩散，无泄漏，与操作者不接触，对人体无害。（2）使用范围广，演示效果直观，移动方便。（3）从加注水银实验开始到排出水银 Hood barometer is a mercury barometer that is made by repeated experiments and improvements. It can measure and demonstrate, simple, time-saving and pollution-free. A new breakthrough was achieved in the Torelli demo demonstrator. 1. Characteristics Q) Mercury does not spread, leaks, does not come into contact with the operator, and is harmless to the human body. (2) Wide range of use, intuitive demonstration effect and convenient movement. (3) From mercury injection experiment to discharge of mercury