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

Carbon dioxide is a colorless and odorless gas, which naturally exists in the air. Although the content of carbon dioxide in the air is relatively small, it is one of the most important gases we know.

Dry ice is volatile and sublimated into non-toxic and odorless gas carbon dioxide, which is 600-800 times larger than the solid volume, so dry ice cannot be stored in containers with completely sealed volume, such as plastic bottles, and it is easy to explode when mixed with liquids.

Extended data:

Remember to be careful every time you touch dry ice. Touch dry ice with thick cotton gloves or other shelter! If it is in direct contact with the skin for a long time, it may cause cell freezing and similar slight or extremely serious frostbite damage.

Dry ice cannot be used in sealed places such as cars and cabins, because the sublimated carbon dioxide will be denser than oxygen, so it will squeeze out oxygen, which may lead to shortness of breath or even suffocation.

Never let children touch dry ice alone. The temperature of dry ice is extremely low. Please don't put it in your mouth to prevent frostbite.

References:

Dry ice-Baidu Encyclopedia