Dry ice is the solid form of carbon dioxide (CO2) and is classified as a cryogenic material due to its extremely low temperature of -78.5°C (-109.3°F). Unlike regular ice, dry ice sublimates, transitioning directly from a solid to a gas without passing through a liquid phase. This property makes it highly useful when refrigeration is required, but liquid water would be problematic.
The Department of Transportation and International Air Transport Association classify dry ice as a miscellaneous hazard, class 9. Laboratory professionals must understand that dry ice poses significant risks due to its extreme cold and potential to displace oxygen in confined spaces.
