Dry Ice - solid carbon dioxide
When carbon dioxide is cooled to -80 degree celsius, it freezes to a white solid called dry ice.
Why is it called dry ice? It is called dry ice because it changes directly from solid to carbon dioxide gas, without going wet.
Dry ice is much colder than water ice, so it is used to keep things, cold and dry. Dry ice is used to preserve ice creams and biological samples.
Dry ice is also used in cloud seeding. In this process, tiny particles of dry ice are dropped from aircraft into clouds, to induce rain.
