Question

Give reasons for the following statement:

Dry ice is used in the refrigeration of food items.

Answer 1

• Dry ice is just a cooled and condensed form of Carbon dioxide(${\mathrm{CO}}_2$).
• Once it reaches room temperature and pressure, it expands i.e. it skips the melting process and sublimates directly into Carbon dioxide gas(${\mathrm{CO}}_2$).
• Dry Ice is manufactured by compressing and cooling gaseous ${\mathrm{CO}}_2$ under high pressure to initially produce liquid ${\mathrm{CO}}_2$.
• Due to its extremely low temperature of -78°c, dry ice is often used as an alternative to refrigeration for foodstuffs and medical supplies.