Dry ice is the common name for solid carbon dioxide . It gets this name because it does not melt into a liquid when heated, instead it changes directly into a gas. (This process is known as sublimation). It is manufactured by compressing and cooling gaseous under high pressure to initially produced liquid . Due to its extremely low temperature of , dry ice is often used as an alternative to refrigeration for foodstuffs and medical supplies. In addition, special dry ice pellets are used for industrial cleaning.