The simple method is to put a canvas bag on the mouth of the container containing liquid carbon dioxide, and then open the container to release carbon dioxide, so that some dry ice can be collected in the pocket. Mass production needs a special dry ice maker. Dry ice should be stored in high-pressure steel cylinders. If there is no high-pressure steel cylinder, it can be stored in the freezer of the refrigerator for 5 ~ 10 days.

1. Dry ice is solid carbon dioxide, which is condensed into colorless liquid under the pressure of 6250.5498 kPa, and then rapidly solidified under low pressure.

2. The history of dry ice can be traced back to 1823, when two Englishmen named Faraday and Peter liquefied carbon dioxide for the first time, and then 1834 successfully produced solid carbon dioxide in Quirrell, Germany. But it was only used for research at that time and was not widely used.

3. Features: Carbon dioxide is invisible, but it is actually not smoke (carbon dioxide), but fog (water). When carbon dioxide changes from solid to gas, it absorbs a lot of heat, which makes the temperature of the surrounding air drop rapidly. When the temperature of air drops, its solubility in water vapor becomes smaller, and the water vapor liquefies and releases heat, turning into small water droplets, that is, fog. This is the same as the "white fog" of popsicles in summer. It's all water droplets, not other gaseous substances.

4. Use history: 1925 The dry ice co., Ltd. established in the United States successfully industrialized mass production of dry ice. At that time, the name of the finished product was dry ice, but its official name was solid carbon dioxide. 1928, Japan obtained the manufacturing and sales rights from dry ice co., ltd, and established Japan dry ice co., ltd, the predecessor of showa carbonic acid co., ltd. ..