Dry ice, sometimes referred to as cardice , is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue . It is useful for preserving frozen foods where mechanical cooling is unavailable.

Dry ice sublimes at −78.5 °C at Earth atmospheric pressures. This extreme cold makes the solid dangerous to handle without protection due to burns caused by freezing . While generally not very toxic, the outgassing from it can cause hypercapnia due to buildup in confined locations. (source : wikipedia)

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