Question

Dry ice is used in the refrigeration of food items to keep them cold. Give reason.

Answer 1

• Carbon dioxide can be liquefied at room temperature by applying high pressure.
• When this liquid carbon dioxide is cooled$-78°\mathrm{C}$, it leads to the formation of solid dry ice.
• Dry ice is used in the refrigeration of food items to keep them cold because it sublimes instead of turning to liquid and hence does not wet food items.