Dry ice is a solid form of carbon dioxide, a colorless and odorless gas that naturally exists in the air. Although the content of carbon dioxide in air is relatively small (about 0.03% by volume), it is one of the most important gases we know. Dry ice is easy to volatilize and sublimate into gaseous carbon dioxide, which is non-toxic and tasteless and is 1000 times larger than the solid area.

Widely used in stage, theater, film and television, wedding, celebration, party effect and so on. For example, some programs in the National Theatre are made of dry ice.

If it is in direct contact with the skin for a long time, it may cause cell freezing and similar minor or extremely serious burns. Dry ice cannot be used in cars, cabins and other places, because sublimated carbon dioxide will replace oxygen, which may lead to shortness of breath or even suffocation!