First, the preservation method:
1. Dry ice must be stored in a professional storage box. In professional storage boxes, dry ice can be stored for 5 to 10 days. After the storage period expires, dry ice will condense together to form an ice mass, or even change from solid to gas, and the effect and function of dry ice will be greatly reduced.
3, ordinary families can use foam boxes to store, remember that it is best to store them as a whole, which will slow down the unnecessary gasification of many dry ice and facilitate longer storage.
Second, the use method:
1, dry ice with wood or wooden chopsticks, and let it stand for use. Can be used for food refrigeration, but try not to touch food. Dry ice is solid carbon dioxide, which will vaporize quickly when it meets water or hot water, producing a large number of smoke screens. Try not to touch dry ice directly.
2. Dry ice can also be used as a fire extinguisher. Dry ice fire extinguisher is the application of dry ice in the field of fire fighting, and it is also one of the important uses of dry ice. Dry ice fire extinguishers use liquid carbon dioxide stored in high-pressure gas cylinders as fire extinguishing agents. After pressing the switch, the pressure in the bottle drops, and the liquid carbon dioxide vaporizes into carbon dioxide gas, which isolates the air.
Use of dry ice:
1, the cooling temperature is much lower than that of ice, and the use of "dry ice" can produce a low temperature of -78℃. Moreover, after melting, "dry ice" will not become liquid like ice, but directly evaporate into dry carbon dioxide gas with extremely low temperature. Now, "dry ice" is used to preserve perishable food.
2. Dry ice will evaporate when heated, and absorb a lot of heat from the surroundings. When the ambient air temperature drops, water molecules in the air condense when they are cold, and solid substances such as dust in the air condense into small water droplets, forming rainfall.