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  • Dry Ice," the trademark name for solid carbon dioxide, reaches its solid state when cooled liquid carbon dioxide is put under pressure.
  • Dry ice, sometimes referred to as "Cardice" or as "card ice", is the solid form of carbon dioxide. It is used primarily as a cooling agent.
  • Dry ice advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere). It is useful for preserving frozen foods, ice cream, etc.,
  • Dry ice is the solid form of carbon dioxide (chemical formula CO2), comprising two oxygen atoms bonded to a single carbon atom. It is colorless, odorless, non-flammable, and slightly acidic.
  • Dry ice is solidified carbon dioxide (CO2). Distinct from regular ice, which exists at temperatures of 32F (0C) and below, dry ice is extremely cold, -109F (-79C).
  • The density of dry ice varies, but usually ranges between about 1.4 and 1.6 g/cm3 (87100 lb/ft3).
  • It may also be used to generate carbon dioxide gas to displace oxygen-bearing atmosphere and to carbonate liquids (especially in a party punch due to the bubbles and moisture vapors that form a visual interest).
  • Dry ice is easily manufactured.
    • First, gases with a high concentration of carbon dioxide are produced. Such gases can be a byproduct of another  process, such as producing ammonia from nitrogen and natural gas, or large-scale fermentation.
    • Second, the carbon dioxide-rich gas is pressurized and refrigerated until it liquifies. Next, the pressure is reduced. When this occurs some liquid carbon dioxide vaporizes, causing a rapid lowering of temperature of the remaining liquid.
    • As a result, the extreme cold causes the liquid to solidify into a snow-like consistency. Finally, the snow-like solid carbon dioxide is compressed into either small pellets or larger blocks of dry ice.
  • Dry ice is typically produced in two standard forms: blocks and cylindrical pellets. A standard block weighing approximately 30 kg is most common. Pellets are around 1 cm (0.4 in) in diameter and can be bagged easily. This form is suited to small scale use, for example at grocery stores and laboratories.
  • One of the largest mechanical uses of dry ice is blast cleaning. Dry ice pellets are shot out of a nozzle with compressed air. This can remove residues from industrial equipment.
  • Dry ice can be used to arrest and prevent insect activity in closed containers of grains and grain products, as it displaces oxygen, but does not alter the taste or quality of such foods. For the same reason, it can prevent or retard food oils and fats from becoming rancid.

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