Dry ice is the solid form of carbon dioxide (CO2). It is used extensively as a cooling agent in a variety of applications such as food chilling and freezing, vaccine cooling, expendable refrigeration, blood and tissue sample preservation, heat treating of metals, and many more. It is also sometimes used to create special effects such as fog for events or stage presentations.
Dry ice is extremely cold (-109.3 °F / -78.5 °C) and rapidly sublimates, or converts, into carbon dioxide gas at room temperature. It is critical that users read and follow the instructions and safety precautions provided by their dry ice supplier.
Anyone who handles dry ice should be aware of its unique properties and potential hazards. These include the extremely cold temperature, potential to create an oxygen-deficient atmosphere, and rapid conversion from a solid to gas. This safety poster, provided by the Compressed Gas Association, provides basic safety information for the handling, transport, and use of dry ice.