# What is crystallization?

A good example of a chemical which readily undergoes sublimation and crystallization is carbon dioxide. ($C {O}_{2}$).
Sublimation : $C {O}_{2 \left(s\right)} \to C {O}_{2 \left(g\right)}$.
Crystallization : $C {O}_{2 \left(g\right)} \to C {O}_{2 \left(s\right)}$