As solid carbon dioxide, dry ice has been widely used in stages, theaters, movies, weddings, celebrations, parties and other places, producing general visual effects. In China and even the world, there are countless classic special effects programs made with dry ice.

Dry ice is solid carbon dioxide, which can condense carbon dioxide into colorless liquid under the pressure of 6250.5498 kPa, and then rapidly solidify under low pressure.

Carbon dioxide is invisible to the naked eye. It's not smoke, it's fog. When carbon dioxide changes from solid to gas, it absorbs a lot of heat, which makes the temperature of the surrounding air drop rapidly. Then when the air temperature drops, its solubility in water vapor becomes smaller. When water vapor liquefies and releases heat, it will turn into small water droplets, which is already fog.

Extended data:

Dry ice is in danger of explosion. If it is stored improperly, there will still be certain risks, so it should be used with caution. Therefore, the industrial and commercial law enforcement departments suggest that consumers should dispose of unused dry ice in time or put it in an unsealed space.

And dry ice is very easy to frostbite the skin. The refrigeration effect of ice is more than 1.5 times that of water ice. When dry ice volatilizes, it will lead to a sharp drop in the surrounding temperature, and there is a potential risk of frostbite. So try not to let dry ice directly touch people's skin to avoid frostbite. When taking dry ice, you must also use thick cotton gloves, clips and other spacers.

References:

People's Network-Dry ice can be used for food preservation, but the risk of explosion and frostbite cannot be ignored.

References:

Baidu encyclopedia-dry ice